diff --git a/Makefile b/Makefile
index bc6c3fbafd056..dced1380341e4 100644
--- a/Makefile
+++ b/Makefile
@@ -147,10 +147,8 @@ testSuite:
 	@echo "testSuite"
 	./tools/check/check_testSuite.sh
 
-clean:
+clean: failpoint-disable
 	$(GO) clean -i ./...
-	rm -rf *.out
-	rm -rf parser
 
 # Split tests for CI to run `make test` in parallel.
 test: test_part_1 test_part_2
diff --git a/cmd/explaintest/r/explain.result b/cmd/explaintest/r/explain.result
index 34ba40144e66e..cd87312a0d2dd 100644
--- a/cmd/explaintest/r/explain.result
+++ b/cmd/explaintest/r/explain.result
@@ -39,3 +39,8 @@ StreamAgg_8	8000.00	root		group by:Column#7, funcs:group_concat(Column#5, Column
   └─TableReader_15	10000.00	root		data:TableFullScan_14
     └─TableFullScan_14	10000.00	cop[tikv]	table:t	keep order:true, stats:pseudo
 drop table t;
+drop view if exists v;
+create view v as select cast(replace(substring_index(substring_index("",',',1),':',-1),'"','') as CHAR(32)) as event_id;
+desc v;
+Field	Type	Null	Key	Default	Extra
+event_id	varchar(32)	YES		NULL	
diff --git a/cmd/explaintest/r/explain_easy.result b/cmd/explaintest/r/explain_easy.result
index 6f954211f94d0..7b92ecbaeefd8 100644
--- a/cmd/explaintest/r/explain_easy.result
+++ b/cmd/explaintest/r/explain_easy.result
@@ -556,28 +556,29 @@ Projection_4	10.00	root		plus(1, test.t.nb)->Column#5
 explain select * from t ta left outer join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(ta.nb, 1) or ta.nb is null;
 id	estRows	task	access object	operator info
 HashJoin_7	8320.83	root		left outer join, equal:[eq(test.t.nb, test.t.nb)], left cond:[gt(test.t.a, 1)]
-├─TableReader_13(Build)	10000.00	root		data:TableFullScan_12
-│ └─TableFullScan_12	10000.00	cop[tikv]	table:tb	keep order:false, stats:pseudo
+├─TableReader_14(Build)	6656.67	root		data:Selection_13
+│ └─Selection_13	6656.67	cop[tikv]		or(test.t.nb, 0)
+│   └─TableFullScan_12	10000.00	cop[tikv]	table:tb	keep order:false, stats:pseudo
 └─TableReader_11(Probe)	6656.67	root		data:Selection_10
-  └─Selection_10	6656.67	cop[tikv]		or(test.t.nb, isnull(test.t.nb))
+  └─Selection_10	6656.67	cop[tikv]		or(test.t.nb, 0)
     └─TableFullScan_9	10000.00	cop[tikv]	table:ta	keep order:false, stats:pseudo
 explain select * from t ta right outer join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(tb.nb, 1) or tb.nb is null;
 id	estRows	task	access object	operator info
 HashJoin_7	6656.67	root		right outer join, equal:[eq(test.t.nb, test.t.nb)]
-├─TableReader_11(Build)	3333.33	root		data:Selection_10
-│ └─Selection_10	3333.33	cop[tikv]		gt(test.t.a, 1)
+├─TableReader_11(Build)	2218.89	root		data:Selection_10
+│ └─Selection_10	2218.89	cop[tikv]		gt(test.t.a, 1), or(test.t.nb, 0)
 │   └─TableFullScan_9	10000.00	cop[tikv]	table:ta	keep order:false, stats:pseudo
 └─TableReader_14(Probe)	6656.67	root		data:Selection_13
-  └─Selection_13	6656.67	cop[tikv]		or(test.t.nb, isnull(test.t.nb))
+  └─Selection_13	6656.67	cop[tikv]		or(test.t.nb, 0)
     └─TableFullScan_12	10000.00	cop[tikv]	table:tb	keep order:false, stats:pseudo
 explain select * from t ta inner join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(tb.nb, 1) or tb.nb is null;
 id	estRows	task	access object	operator info
-HashJoin_9	4166.67	root		inner join, equal:[eq(test.t.nb, test.t.nb)]
-├─TableReader_12(Build)	3333.33	root		data:Selection_11
-│ └─Selection_11	3333.33	cop[tikv]		gt(test.t.a, 1)
+HashJoin_9	2773.61	root		inner join, equal:[eq(test.t.nb, test.t.nb)]
+├─TableReader_12(Build)	2218.89	root		data:Selection_11
+│ └─Selection_11	2218.89	cop[tikv]		gt(test.t.a, 1), or(test.t.nb, 0)
 │   └─TableFullScan_10	10000.00	cop[tikv]	table:ta	keep order:false, stats:pseudo
 └─TableReader_15(Probe)	6656.67	root		data:Selection_14
-  └─Selection_14	6656.67	cop[tikv]		or(test.t.nb, isnull(test.t.nb))
+  └─Selection_14	6656.67	cop[tikv]		or(test.t.nb, 0)
     └─TableFullScan_13	10000.00	cop[tikv]	table:tb	keep order:false, stats:pseudo
 explain select ifnull(t.nc, 1) in (select count(*) from t s , t t1 where s.a = t.a and s.a = t1.a) from t;
 id	estRows	task	access object	operator info
diff --git a/cmd/explaintest/r/partition_pruning.result b/cmd/explaintest/r/partition_pruning.result
index cf9b019d374c9..fd5930d18ae1b 100644
--- a/cmd/explaintest/r/partition_pruning.result
+++ b/cmd/explaintest/r/partition_pruning.result
@@ -2333,8 +2333,8 @@ TableReader_7	250.00	root	partition:all	data:Selection_6
   └─TableFullScan_5	10000.00	cop[tikv]	table:t1	keep order:false, stats:pseudo
 explain select * from t1 where a>=0 and a <= 0xFFFFFFFFFFFFFFFF;
 id	estRows	task	access object	operator info
-TableReader_7	250.00	root	partition:all	data:Selection_6
-└─Selection_6	250.00	cop[tikv]		ge(test.t1.a, 0), le(test.t1.a, 18446744073709551615)
+TableReader_7	3323.33	root	partition:all	data:Selection_6
+└─Selection_6	3323.33	cop[tikv]		le(test.t1.a, 18446744073709551615)
   └─TableFullScan_5	10000.00	cop[tikv]	table:t1	keep order:false, stats:pseudo
 drop table t1;
 create table t1 (a bigint) partition by range(a+0) (
diff --git a/cmd/explaintest/t/explain.test b/cmd/explaintest/t/explain.test
index 3bde3f5d7d5ca..33fd0e7165d61 100644
--- a/cmd/explaintest/t/explain.test
+++ b/cmd/explaintest/t/explain.test
@@ -14,3 +14,7 @@ set session tidb_hashagg_final_concurrency = 1;
 explain select group_concat(a) from t group by id;
 explain select group_concat(a, b) from t group by id;
 drop table t;
+
+drop view if exists v;
+create view v as select cast(replace(substring_index(substring_index("",',',1),':',-1),'"','') as CHAR(32)) as event_id;
+desc v;
diff --git a/config/config.go b/config/config.go
index c64576c9b07d5..40049b57d0465 100644
--- a/config/config.go
+++ b/config/config.go
@@ -38,6 +38,7 @@ import (
 	tracing "github.com/uber/jaeger-client-go/config"
 
 	"go.uber.org/zap"
+	"google.golang.org/grpc/encoding/gzip"
 )
 
 // Config number limitations
@@ -493,6 +494,8 @@ type TiKVClient struct {
 	// After having pinged for keepalive check, the client waits for a duration of Timeout in seconds
 	// and if no activity is seen even after that the connection is closed.
 	GrpcKeepAliveTimeout uint `toml:"grpc-keepalive-timeout" json:"grpc-keepalive-timeout"`
+	// GrpcCompressionType is the compression type for gRPC channel: none or gzip.
+	GrpcCompressionType string `toml:"grpc-compression-type" json:"grpc-compression-type"`
 	// CommitTimeout is the max time which command 'commit' will wait.
 	CommitTimeout string      `toml:"commit-timeout" json:"commit-timeout"`
 	AsyncCommit   AsyncCommit `toml:"async-commit" json:"async-commit"`
@@ -693,6 +696,7 @@ var defaultConf = Config{
 		GrpcConnectionCount:  4,
 		GrpcKeepAliveTime:    10,
 		GrpcKeepAliveTimeout: 3,
+		GrpcCompressionType:  "none",
 		CommitTimeout:        "41s",
 		AsyncCommit: AsyncCommit{
 			Enable: false,
@@ -882,7 +886,7 @@ func (c *Config) Valid() error {
 	if c.Security.SkipGrantTable && !hasRootPrivilege() {
 		return fmt.Errorf("TiDB run with skip-grant-table need root privilege")
 	}
-	if _, ok := ValidStorage[c.Store]; !ok {
+	if !ValidStorage[c.Store] {
 		nameList := make([]string, 0, len(ValidStorage))
 		for k, v := range ValidStorage {
 			if v {
@@ -918,6 +922,9 @@ func (c *Config) Valid() error {
 	if c.TiKVClient.GrpcConnectionCount == 0 {
 		return fmt.Errorf("grpc-connection-count should be greater than 0")
 	}
+	if c.TiKVClient.GrpcCompressionType != "none" && c.TiKVClient.GrpcCompressionType != gzip.Name {
+		return fmt.Errorf("grpc-compression-type should be none or %s, but got %s", gzip.Name, c.TiKVClient.GrpcCompressionType)
+	}
 
 	if c.Performance.TxnTotalSizeLimit > 10<<30 {
 		return fmt.Errorf("txn-total-size-limit should be less than %d", 10<<30)
diff --git a/config/config.toml.example b/config/config.toml.example
index 3fdb3863d76bf..fb119a41b75e7 100644
--- a/config/config.toml.example
+++ b/config/config.toml.example
@@ -353,6 +353,9 @@ grpc-keepalive-time = 10
 # and if no activity is seen even after that the connection is closed.
 grpc-keepalive-timeout = 3
 
+# The compression type for gRPC channel: none or gzip.
+grpc-compression-type = "none"
+
 # Max time for commit command, must be twice bigger than raft election timeout.
 commit-timeout = "41s"
 
diff --git a/ddl/column.go b/ddl/column.go
index 07ece53470b23..cf4d55c20e034 100644
--- a/ddl/column.go
+++ b/ddl/column.go
@@ -516,17 +516,18 @@ func checkDropColumnForStatePublic(tblInfo *model.TableInfo, colInfo *model.Colu
 	// When the dropping column has not-null flag and it hasn't the default value, we can backfill the column value like "add column".
 	// NOTE: If the state of StateWriteOnly can be rollbacked, we'd better reconsider the original default value.
 	// And we need consider the column without not-null flag.
-	if colInfo.OriginDefaultValue == nil && mysql.HasNotNullFlag(colInfo.Flag) {
+	if colInfo.GetOriginDefaultValue() == nil && mysql.HasNotNullFlag(colInfo.Flag) {
 		// If the column is timestamp default current_timestamp, and DDL owner is new version TiDB that set column.Version to 1,
 		// then old TiDB update record in the column write only stage will uses the wrong default value of the dropping column.
 		// Because new version of the column default value is UTC time, but old version TiDB will think the default value is the time in system timezone.
 		// But currently will be ok, because we can't cancel the drop column job when the job is running,
 		// so the column will be dropped succeed and client will never see the wrong default value of the dropped column.
 		// More info about this problem, see PR#9115.
-		colInfo.OriginDefaultValue, err = generateOriginDefaultValue(colInfo)
+		originDefVal, err := generateOriginDefaultValue(colInfo)
 		if err != nil {
 			return err
 		}
+		return colInfo.SetOriginDefaultValue(originDefVal)
 	}
 	return nil
 }
diff --git a/ddl/db_integration_test.go b/ddl/db_integration_test.go
index eacff4bc2d5a5..4a8b7a8a20328 100644
--- a/ddl/db_integration_test.go
+++ b/ddl/db_integration_test.go
@@ -1118,6 +1118,18 @@ func (s *testIntegrationSuite5) TestBitDefaultValue(c *C) {
 	tk.MustQuery("select c from t_bit").Check(testkit.Rows("\x19\xb9"))
 	tk.MustExec("update t_bit set c = b'11100000000111'")
 	tk.MustQuery("select c from t_bit").Check(testkit.Rows("\x38\x07"))
+	tk.MustExec("drop table t_bit")
+
+	tk.MustExec("create table t_bit (a int)")
+	tk.MustExec("insert into t_bit value (1)")
+	tk.MustExec("alter table t_bit add column b bit(1) default b'0';")
+	tk.MustExec("alter table t_bit modify column b bit(1) default b'1';")
+	tk.MustQuery("select b from t_bit").Check(testkit.Rows("\x00"))
+	tk.MustExec("drop table t_bit")
+
+	tk.MustExec("create table t_bit (a bit);")
+	tk.MustExec("insert into t_bit values (null);")
+	tk.MustQuery("select count(*) from t_bit where a is null;").Check(testkit.Rows("1"))
 
 	tk.MustExec(`create table testalltypes1 (
     field_1 bit default 1,
@@ -2188,6 +2200,8 @@ func (s *testIntegrationSuite7) TestCreateExpressionIndexError(c *C) {
 	tk.MustExec("drop table if exists t;")
 	tk.MustGetErrCode("create table t (j json, key k (((j,j))))", errno.ErrFunctionalIndexRowValueIsNotAllowed)
 	tk.MustExec("create table t (j json, key k ((j+1),(j+1)))")
+
+	tk.MustGetErrCode("create table t1 (col1 int, index ((concat(''))));", errno.ErrWrongKeyColumnFunctionalIndex)
 }
 
 func (s *testIntegrationSuite7) TestAddExpressionIndexOnPartition(c *C) {
diff --git a/ddl/ddl.go b/ddl/ddl.go
index a764d51e0b755..096437fd40f60 100644
--- a/ddl/ddl.go
+++ b/ddl/ddl.go
@@ -110,6 +110,7 @@ type DDL interface {
 	RepairTable(ctx sessionctx.Context, table *ast.TableName, createStmt *ast.CreateTableStmt) error
 	CreateSequence(ctx sessionctx.Context, stmt *ast.CreateSequenceStmt) error
 	DropSequence(ctx sessionctx.Context, tableIdent ast.Ident, ifExists bool) (err error)
+	AlterSequence(ctx sessionctx.Context, stmt *ast.AlterSequenceStmt) error
 
 	// CreateSchemaWithInfo creates a database (schema) given its database info.
 	//
diff --git a/ddl/ddl_api.go b/ddl/ddl_api.go
index 43162467d9202..232ece09ec22e 100644
--- a/ddl/ddl_api.go
+++ b/ddl/ddl_api.go
@@ -353,6 +353,25 @@ func ResolveCharsetCollation(charsetOpts ...ast.CharsetOpt) (string, string, err
 	return chs, coll, nil
 }
 
+// OverwriteCollationWithBinaryFlag is used to handle the case like
+//   CREATE TABLE t (a VARCHAR(255) BINARY) CHARSET utf8 COLLATE utf8_general_ci;
+// The 'BINARY' sets the column collation to *_bin according to the table charset.
+func OverwriteCollationWithBinaryFlag(colDef *ast.ColumnDef, chs, coll string) (newChs string, newColl string) {
+	ignoreBinFlag := colDef.Tp.Charset != "" && (colDef.Tp.Collate != "" || containsColumnOption(colDef, ast.ColumnOptionCollate))
+	if ignoreBinFlag {
+		return chs, coll
+	}
+	needOverwriteBinColl := types.IsString(colDef.Tp.Tp) && mysql.HasBinaryFlag(colDef.Tp.Flag)
+	if needOverwriteBinColl {
+		newColl, err := charset.GetDefaultCollation(chs)
+		if err != nil {
+			return chs, coll
+		}
+		return chs, newColl
+	}
+	return chs, coll
+}
+
 func typesNeedCharset(tp byte) bool {
 	switch tp {
 	case mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString,
@@ -412,6 +431,7 @@ func buildColumnAndConstraint(
 		ast.CharsetOpt{Chs: chs, Col: coll},
 		ast.CharsetOpt{Chs: tblCharset, Col: tblCollate},
 	)
+	chs, coll = OverwriteCollationWithBinaryFlag(colDef, chs, coll)
 	if err != nil {
 		return nil, nil, errors.Trace(err)
 	}
@@ -504,8 +524,12 @@ func isExplicitTimeStamp() bool {
 
 // processColumnFlags is used by columnDefToCol and processColumnOptions. It is intended to unify behaviors on `create/add` and `modify/change` statements. Check tidb#issue#19342.
 func processColumnFlags(col *table.Column) {
-	if col.FieldType.EvalType().IsStringKind() && col.Charset == charset.CharsetBin {
-		col.Flag |= mysql.BinaryFlag
+	if col.FieldType.EvalType().IsStringKind() {
+		if col.Charset == charset.CharsetBin {
+			col.Flag |= mysql.BinaryFlag
+		} else {
+			col.Flag &= ^mysql.BinaryFlag
+		}
 	}
 	if col.Tp == mysql.TypeBit {
 		// For BIT field, it's charset is binary but does not have binary flag.
@@ -2619,11 +2643,13 @@ func checkAndCreateNewColumn(ctx sessionctx.Context, ti ast.Ident, schema *model
 		return nil, errors.Trace(err)
 	}
 
-	col.OriginDefaultValue, err = generateOriginDefaultValue(col.ToInfo())
+	originDefVal, err := generateOriginDefaultValue(col.ToInfo())
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
-	return col, nil
+
+	err = col.SetOriginDefaultValue(originDefVal)
+	return col, err
 }
 
 // AddColumn will add a new column to the table.
@@ -3539,12 +3565,13 @@ func (d *ddl) getModifiableColumnJob(ctx sessionctx.Context, ident ast.Ident, or
 		// a new version TiDB builds the DDL job that doesn't be set the column's offset and state,
 		// and the old version TiDB is the DDL owner, it doesn't get offset and state from the store. Then it will encounter errors.
 		// So here we set offset and state to support the rolling upgrade.
-		Offset:             col.Offset,
-		State:              col.State,
-		OriginDefaultValue: col.OriginDefaultValue,
-		FieldType:          *specNewColumn.Tp,
-		Name:               newColName,
-		Version:            col.Version,
+		Offset:                col.Offset,
+		State:                 col.State,
+		OriginDefaultValue:    col.OriginDefaultValue,
+		OriginDefaultValueBit: col.OriginDefaultValueBit,
+		FieldType:             *specNewColumn.Tp,
+		Name:                  newColName,
+		Version:               col.Version,
 	})
 
 	var chs, coll string
@@ -3564,6 +3591,7 @@ func (d *ddl) getModifiableColumnJob(ctx sessionctx.Context, ident ast.Ident, or
 			ast.CharsetOpt{Chs: t.Meta().Charset, Col: t.Meta().Collate},
 			ast.CharsetOpt{Chs: schema.Charset, Col: schema.Collate},
 		)
+		chs, coll = OverwriteCollationWithBinaryFlag(specNewColumn, chs, coll)
 		if err != nil {
 			return nil, errors.Trace(err)
 		}
@@ -4543,7 +4571,7 @@ func buildHiddenColumnInfo(ctx sessionctx.Context, indexPartSpecifications []*as
 		if err = checkDependedColExist(checkDependencies, existCols); err != nil {
 			return nil, errors.Trace(err)
 		}
-		if err = checkAutoIncrementRef("", colInfo.Dependences, tblInfo); err != nil {
+		if err = checkExpressionIndexAutoIncrement(indexName.O, colInfo.Dependences, tblInfo); err != nil {
 			return nil, errors.Trace(err)
 		}
 		idxPart.Expr = nil
@@ -5291,6 +5319,49 @@ func (d *ddl) CreateSequence(ctx sessionctx.Context, stmt *ast.CreateSequenceStm
 	return d.CreateTableWithInfo(ctx, ident.Schema, tbInfo, onExist, false /*tryRetainID*/)
 }
 
+func (d *ddl) AlterSequence(ctx sessionctx.Context, stmt *ast.AlterSequenceStmt) error {
+	ident := ast.Ident{Name: stmt.Name.Name, Schema: stmt.Name.Schema}
+	is := d.GetInfoSchemaWithInterceptor(ctx)
+	// Check schema existence.
+	db, ok := is.SchemaByName(ident.Schema)
+	if !ok {
+		return infoschema.ErrDatabaseNotExists.GenWithStackByArgs(ident.Schema)
+	}
+	// Check table existence.
+	tbl, err := is.TableByName(ident.Schema, ident.Name)
+	if err != nil {
+		if stmt.IfExists {
+			ctx.GetSessionVars().StmtCtx.AppendNote(err)
+			return nil
+		}
+		return err
+	}
+	if !tbl.Meta().IsSequence() {
+		return ErrWrongObject.GenWithStackByArgs(ident.Schema, ident.Name, "SEQUENCE")
+	}
+
+	// Validate the new sequence option value in old sequenceInfo.
+	oldSequenceInfo := tbl.Meta().Sequence
+	copySequenceInfo := *oldSequenceInfo
+	_, _, err = alterSequenceOptions(stmt.SeqOptions, ident, &copySequenceInfo)
+	if err != nil {
+		return err
+	}
+
+	job := &model.Job{
+		SchemaID:   db.ID,
+		TableID:    tbl.Meta().ID,
+		SchemaName: db.Name.L,
+		Type:       model.ActionAlterSequence,
+		BinlogInfo: &model.HistoryInfo{},
+		Args:       []interface{}{ident, stmt.SeqOptions},
+	}
+
+	err = d.doDDLJob(ctx, job)
+	err = d.callHookOnChanged(err)
+	return errors.Trace(err)
+}
+
 func (d *ddl) DropSequence(ctx sessionctx.Context, ti ast.Ident, ifExists bool) (err error) {
 	schema, tbl, err := d.getSchemaAndTableByIdent(ctx, ti)
 	if err != nil {
diff --git a/ddl/ddl_worker.go b/ddl/ddl_worker.go
index 38d547d67eb1c..dd79b95876c72 100644
--- a/ddl/ddl_worker.go
+++ b/ddl/ddl_worker.go
@@ -685,6 +685,8 @@ func (w *worker) runDDLJob(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64,
 		ver, err = onAlterIndexVisibility(t, job)
 	case model.ActionAlterTableAlterPartition:
 		ver, err = onAlterTablePartition(t, job)
+	case model.ActionAlterSequence:
+		ver, err = onAlterSequence(t, job)
 	default:
 		// Invalid job, cancel it.
 		job.State = model.JobStateCancelled
diff --git a/ddl/error.go b/ddl/error.go
index c450c1f8e15e8..c75ccb1b6d487 100644
--- a/ddl/error.go
+++ b/ddl/error.go
@@ -64,6 +64,8 @@ var (
 	errOnlyOnRangeListPartition = terror.ClassDDL.New(mysql.ErrOnlyOnRangeListPartition, mysql.MySQLErrName[mysql.ErrOnlyOnRangeListPartition])
 	// errWrongKeyColumn is for table column cannot be indexed.
 	errWrongKeyColumn = terror.ClassDDL.New(mysql.ErrWrongKeyColumn, mysql.MySQLErrName[mysql.ErrWrongKeyColumn])
+	// errWrongKeyColumnFunctionalIndex is for expression cannot be indexed.
+	errWrongKeyColumnFunctionalIndex = terror.ClassDDL.New(mysql.ErrWrongKeyColumnFunctionalIndex, mysql.MySQLErrName[mysql.ErrWrongKeyColumnFunctionalIndex])
 	// errWrongFKOptionForGeneratedColumn is for wrong foreign key reference option on generated columns.
 	errWrongFKOptionForGeneratedColumn = terror.ClassDDL.New(mysql.ErrWrongFKOptionForGeneratedColumn, mysql.MySQLErrName[mysql.ErrWrongFKOptionForGeneratedColumn])
 	// ErrUnsupportedOnGeneratedColumn is for unsupported actions on generated columns.
@@ -81,6 +83,8 @@ var (
 	ErrInvalidDefaultValue = terror.ClassDDL.New(mysql.ErrInvalidDefault, mysql.MySQLErrName[mysql.ErrInvalidDefault])
 	// ErrGeneratedColumnRefAutoInc forbids to refer generated columns to auto-increment columns .
 	ErrGeneratedColumnRefAutoInc = terror.ClassDDL.New(mysql.ErrGeneratedColumnRefAutoInc, mysql.MySQLErrName[mysql.ErrGeneratedColumnRefAutoInc])
+	// ErrExpressionIndexCanNotRefer forbids to refer expression index to auto-increment column.
+	ErrExpressionIndexCanNotRefer = terror.ClassDDL.New(mysql.ErrFunctionalIndexRefAutoIncrement, mysql.MySQLErrName[mysql.ErrFunctionalIndexRefAutoIncrement])
 	// ErrUnsupportedAddPartition returns for does not support add partitions.
 	ErrUnsupportedAddPartition = terror.ClassDDL.New(mysql.ErrUnsupportedDDLOperation, fmt.Sprintf(mysql.MySQLErrName[mysql.ErrUnsupportedDDLOperation], "add partitions"))
 	// ErrUnsupportedCoalescePartition returns for does not support coalesce partitions.
@@ -200,8 +204,10 @@ var (
 	ErrFunctionalIndexOnField = terror.ClassDDL.New(mysql.ErrFunctionalIndexOnField, mysql.MySQLErrName[mysql.ErrFunctionalIndexOnField])
 	// ErrInvalidAutoRandom returns when auto_random is used incorrectly.
 	ErrInvalidAutoRandom = terror.ClassDDL.New(mysql.ErrInvalidAutoRandom, mysql.MySQLErrName[mysql.ErrInvalidAutoRandom])
-	// ErrUnsupportedConstraintCheck returns when use ADD CONSTRAINT CHECK
+	// ErrUnsupportedConstraintCheck returns when use ADD CONSTRAINT CHECK.
 	ErrUnsupportedConstraintCheck = terror.ClassDDL.New(mysql.ErrUnsupportedConstraintCheck, mysql.MySQLErrName[mysql.ErrUnsupportedConstraintCheck])
+	// ErrDerivedMustHaveAlias returns when a sub select statement does not have a table alias.
+	ErrDerivedMustHaveAlias = terror.ClassDDL.New(mysql.ErrDerivedMustHaveAlias, mysql.MySQLErrName[mysql.ErrDerivedMustHaveAlias])
 
 	// ErrSequenceRunOut returns when the sequence has been run out.
 	ErrSequenceRunOut = terror.ClassDDL.New(mysql.ErrSequenceRunOut, mysql.MySQLErrName[mysql.ErrSequenceRunOut])
diff --git a/ddl/generated_column.go b/ddl/generated_column.go
index 63e25832a0709..d76b030a84434 100644
--- a/ddl/generated_column.go
+++ b/ddl/generated_column.go
@@ -331,3 +331,14 @@ func checkAutoIncrementRef(name string, dependencies map[string]struct{}, tbInfo
 	}
 	return nil
 }
+
+// checkExpressionIndexAutoIncrement checks if an generated column depends on an auto-increment column and raises an error if so.
+func checkExpressionIndexAutoIncrement(name string, dependencies map[string]struct{}, tbInfo *model.TableInfo) error {
+	exists, autoIncrementColumn := infoschema.HasAutoIncrementColumn(tbInfo)
+	if exists {
+		if _, found := dependencies[autoIncrementColumn]; found {
+			return ErrExpressionIndexCanNotRefer.GenWithStackByArgs(name)
+		}
+	}
+	return nil
+}
diff --git a/ddl/index.go b/ddl/index.go
index 26bcbcd411aa9..9b06678bfc575 100644
--- a/ddl/index.go
+++ b/ddl/index.go
@@ -130,6 +130,9 @@ func checkIndexPrefixLength(columns []*model.ColumnInfo, idxColumns []*model.Ind
 
 func checkIndexColumn(col *model.ColumnInfo, ic *ast.IndexPartSpecification) error {
 	if col.Flen == 0 && (types.IsTypeChar(col.FieldType.Tp) || types.IsTypeVarchar(col.FieldType.Tp)) {
+		if col.GeneratedExprString != "" {
+			return errors.Trace(errWrongKeyColumnFunctionalIndex.GenWithStackByArgs(col.GeneratedExprString))
+		}
 		return errors.Trace(errWrongKeyColumn.GenWithStackByArgs(ic.Column.Name))
 	}
 
diff --git a/ddl/sequence.go b/ddl/sequence.go
index ce7b0bdcdd229..c7aa6c47f8507 100644
--- a/ddl/sequence.go
+++ b/ddl/sequence.go
@@ -15,6 +15,7 @@ package ddl
 
 import (
 	"math"
+	"reflect"
 
 	"github.com/cznic/mathutil"
 	"github.com/pingcap/errors"
@@ -183,3 +184,110 @@ func buildSequenceInfo(stmt *ast.CreateSequenceStmt, ident ast.Ident) (*model.Se
 	}
 	return sequenceInfo, nil
 }
+
+func alterSequenceOptions(sequenceOptions []*ast.SequenceOption, ident ast.Ident, oldSequence *model.SequenceInfo) (bool, int64, error) {
+	var (
+		restartFlag     bool
+		restartWithFlag bool
+		restartValue    int64
+	)
+	// Override the old sequence value with new option.
+	for _, op := range sequenceOptions {
+		switch op.Tp {
+		case ast.SequenceOptionIncrementBy:
+			oldSequence.Increment = op.IntValue
+		case ast.SequenceStartWith:
+			oldSequence.Start = op.IntValue
+		case ast.SequenceMinValue:
+			oldSequence.MinValue = op.IntValue
+		case ast.SequenceMaxValue:
+			oldSequence.MaxValue = op.IntValue
+		case ast.SequenceCache:
+			oldSequence.CacheValue = op.IntValue
+		case ast.SequenceNoCache:
+			oldSequence.Cache = false
+		case ast.SequenceCycle:
+			oldSequence.Cycle = true
+		case ast.SequenceNoCycle:
+			oldSequence.Cycle = false
+		case ast.SequenceRestart:
+			restartFlag = true
+		case ast.SequenceRestartWith:
+			restartWithFlag = true
+			restartValue = op.IntValue
+		}
+	}
+	if !validateSequenceOptions(oldSequence) {
+		return false, 0, ErrSequenceInvalidData.GenWithStackByArgs(ident.Schema.L, ident.Name.L)
+	}
+	if restartWithFlag {
+		return true, restartValue, nil
+	}
+	if restartFlag {
+		return true, oldSequence.Start, nil
+	}
+	return false, 0, nil
+}
+
+func onAlterSequence(t *meta.Meta, job *model.Job) (ver int64, _ error) {
+	schemaID := job.SchemaID
+	var (
+		sequenceOpts []*ast.SequenceOption
+		ident        ast.Ident
+	)
+	if err := job.DecodeArgs(&ident, &sequenceOpts); err != nil {
+		// Invalid arguments, cancel this job.
+		job.State = model.JobStateCancelled
+		return ver, errors.Trace(err)
+	}
+
+	// Get the old tableInfo.
+	tblInfo, err := checkTableExistAndCancelNonExistJob(t, job, schemaID)
+	if err != nil {
+		return ver, errors.Trace(err)
+	}
+
+	// Substitute the sequence info.
+	copySequenceInfo := *tblInfo.Sequence
+	restart, restartValue, err := alterSequenceOptions(sequenceOpts, ident, &copySequenceInfo)
+	if err != nil {
+		job.State = model.JobStateCancelled
+		return ver, errors.Trace(err)
+	}
+	shouldUpdateVer := !reflect.DeepEqual(*tblInfo.Sequence, copySequenceInfo) || restart
+	tblInfo.Sequence = &copySequenceInfo
+
+	// Restart the sequence value.
+	// Notice: during the alter sequence process, if there is some dml continually consumes sequence (nextval/setval),
+	// the below cases will occur:
+	// Since the table schema haven't been refreshed in local/other node, dml will still use old definition of sequence
+	// to allocate sequence ids. Once the restart value is updated to kv here, the allocated ids in the upper layer won't
+	// guarantee to be consecutive and monotonous.
+	if restart {
+		err := restartSequenceValue(t, schemaID, tblInfo, restartValue)
+		if err != nil {
+			return ver, errors.Trace(err)
+		}
+	}
+
+	// Store the sequence info into kv.
+	ver, err = updateVersionAndTableInfo(t, job, tblInfo, shouldUpdateVer)
+	if err != nil {
+		return ver, errors.Trace(err)
+	}
+	// Finish this job.
+	job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
+	return ver, nil
+}
+
+// Like setval does, restart sequence value won't affect current the step frequency. It will look backward for
+// the first valid sequence valid rather than return the restart value directly.
+func restartSequenceValue(t *meta.Meta, dbID int64, tblInfo *model.TableInfo, seqValue int64) error {
+	var sequenceBase int64
+	if tblInfo.Sequence.Increment >= 0 {
+		sequenceBase = seqValue - 1
+	} else {
+		sequenceBase = seqValue + 1
+	}
+	return t.RestartSequenceValue(dbID, tblInfo, sequenceBase)
+}
diff --git a/ddl/sequence_test.go b/ddl/sequence_test.go
index 31b41c2bd7d00..f46da112888df 100644
--- a/ddl/sequence_test.go
+++ b/ddl/sequence_test.go
@@ -74,6 +74,7 @@ func (s *testSequenceSuite) TestCreateSequence(c *C) {
 	c.Assert(sequenceTable.Meta().Sequence.Cycle, Equals, false)
 
 	// Test create privilege.
+	tk.MustExec("drop user if exists myuser@localhost")
 	tk.MustExec("create user myuser@localhost")
 
 	tk1 := testkit.NewTestKit(c, s.store)
@@ -989,3 +990,87 @@ func (s *testSequenceSuite) TestSequenceCacheShouldNotBeNegative(c *C) {
 
 	tk.MustExec("create sequence seq cache 1")
 }
+
+func (s *testSequenceSuite) TestAlterSequence(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+
+	tk.MustExec("drop sequence if exists seq")
+	tk.MustExec("create sequence seq")
+	tk.MustExec("alter sequence seq increment by 2 start with 2")
+	tk.MustQuery("show create sequence seq").Check(testkit.Rows("seq CREATE SEQUENCE `seq` " +
+		"start with 2 minvalue 1 maxvalue 9223372036854775806 increment by 2 cache 1000 nocycle ENGINE=InnoDB"))
+
+	tk.MustExec("drop sequence if exists seq")
+	tk.MustExec("create sequence seq")
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("2"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("3"))
+	// Alter sequence will invalidate the sequence cache in memory.
+	tk.MustExec("alter sequence seq increment by 2")
+	tk.MustQuery("show create sequence seq").Check(testkit.Rows("seq CREATE SEQUENCE `seq` " +
+		"start with 1 minvalue 1 maxvalue 9223372036854775806 increment by 2 cache 1000 nocycle ENGINE=InnoDB"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1001"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1003"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1005"))
+
+	// Restart with value will reset the sequence value in kv.
+	tk.MustExec("alter sequence seq restart with 9")
+	// Like setval does, the sequence current value change won't affect the increment frequency.
+	// By now the step frequency is: 1, 3, 5, 7, 9, 11, 13, 15...
+	// After restart with 9, the current value rebased to 8, the next valid value will be 9, coincidentally equal to what we restarted.
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("9"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("11"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("13"))
+
+	tk.MustExec("alter sequence seq restart with 10")
+	// After restart with 10, the current value rebased to 9, the next valid value will be 11, rather than what we restart.
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("11"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("13"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("15"))
+
+	// Restart will reset the sequence value to start value by default.
+	tk.MustExec("alter sequence seq restart")
+	// After restart, the base will be pointed to 0, the first value will be 1 here, then plus the increment 2, the second value will be 3.
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("3"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("5"))
+
+	tk.MustExec("drop sequence if exists seq")
+	tk.MustExec("create sequence seq increment by 3")
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("1"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("4"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("7"))
+
+	tk.MustExec("alter sequence seq increment by 4")
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("3001"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("3005"))
+	tk.MustQuery("select nextval(seq)").Check(testkit.Rows("3009"))
+	tk.MustExec("drop sequence if exists seq")
+}
+
+func (s *testSequenceSuite) TestAlterSequencePrivilege(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop sequence if exists my_seq")
+	tk.MustExec("create sequence my_seq")
+
+	// Test create privilege.
+	tk.MustExec("drop user if exists myuser@localhost")
+	tk.MustExec("create user myuser@localhost")
+
+	tk1 := testkit.NewTestKit(c, s.store)
+	se, err := session.CreateSession4Test(s.store)
+	c.Assert(err, IsNil)
+	c.Assert(se.Auth(&auth.UserIdentity{Username: "myuser", Hostname: "localhost"}, nil, nil), IsTrue)
+	tk1.Se = se
+
+	// grant the myuser the access to database test.
+	tk.MustExec("grant select on test.* to 'myuser'@'localhost'")
+
+	tk1.MustExec("use test")
+	_, err = tk1.Exec("alter sequence my_seq increment = 2")
+	c.Assert(err, NotNil)
+	c.Assert(err.Error(), Equals, "[planner:1142]ALTER command denied to user 'myuser'@'localhost' for table 'my_seq'")
+	tk.MustExec("drop sequence if exists my_seq")
+}
diff --git a/domain/domain.go b/domain/domain.go
index a2557f71d3f81..1c674ac5fe38a 100644
--- a/domain/domain.go
+++ b/domain/domain.go
@@ -1033,8 +1033,13 @@ func (do *Domain) StatsHandle() *handle.Handle {
 }
 
 // CreateStatsHandle is used only for test.
-func (do *Domain) CreateStatsHandle(ctx sessionctx.Context) {
-	atomic.StorePointer(&do.statsHandle, unsafe.Pointer(handle.NewHandle(ctx, do.statsLease)))
+func (do *Domain) CreateStatsHandle(ctx sessionctx.Context) error {
+	h, err := handle.NewHandle(ctx, do.statsLease)
+	if err != nil {
+		return err
+	}
+	atomic.StorePointer(&do.statsHandle, unsafe.Pointer(h))
+	return nil
 }
 
 // StatsUpdating checks if the stats worker is updating.
@@ -1059,7 +1064,10 @@ var RunAutoAnalyze = true
 // It should be called only once in BootstrapSession.
 func (do *Domain) UpdateTableStatsLoop(ctx sessionctx.Context) error {
 	ctx.GetSessionVars().InRestrictedSQL = true
-	statsHandle := handle.NewHandle(ctx, do.statsLease)
+	statsHandle, err := handle.NewHandle(ctx, do.statsLease)
+	if err != nil {
+		return err
+	}
 	atomic.StorePointer(&do.statsHandle, unsafe.Pointer(statsHandle))
 	do.ddl.RegisterEventCh(statsHandle.DDLEventCh())
 	// Negative stats lease indicates that it is in test, it does not need update.
@@ -1120,6 +1128,10 @@ func (do *Domain) loadStatsWorker() {
 	for {
 		select {
 		case <-loadTicker.C:
+			err = statsHandle.RefreshVars()
+			if err != nil {
+				logutil.BgLogger().Debug("refresh variables failed", zap.Error(err))
+			}
 			err = statsHandle.Update(do.InfoSchema())
 			if err != nil {
 				logutil.BgLogger().Debug("update stats info failed", zap.Error(err))
diff --git a/errno/errname.go b/errno/errname.go
index 0a3e0e858a2f3..9aa2b9a857ae6 100644
--- a/errno/errname.go
+++ b/errno/errname.go
@@ -868,25 +868,25 @@ var MySQLErrName = map[uint16]string{
 	ErrRoleNotGranted:                                        "%s is is not granted to %s",
 	ErrMaxExecTimeExceeded:                                   "Query execution was interrupted, max_execution_time exceeded.",
 	ErrLockAcquireFailAndNoWaitSet:                           "Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.",
-	ErrDataTruncatedFunctionalIndex:                          "Data truncated for functional index '%s' at row %d",
-	ErrDataOutOfRangeFunctionalIndex:                         "Value is out of range for functional index '%s' at row %d",
-	ErrFunctionalIndexOnJSONOrGeometryFunction:               "Cannot create a functional index on a function that returns a JSON or GEOMETRY value",
-	ErrFunctionalIndexRefAutoIncrement:                       "Functional index '%s' cannot refer to an auto-increment column",
-	ErrCannotDropColumnFunctionalIndex:                       "Cannot drop column '%s' because it is used by a functional index. In order to drop the column, you must remove the functional index",
-	ErrFunctionalIndexPrimaryKey:                             "The primary key cannot be a functional index",
-	ErrFunctionalIndexOnLob:                                  "Cannot create a functional index on an expression that returns a BLOB or TEXT. Please consider using CAST",
-	ErrFunctionalIndexFunctionIsNotAllowed:                   "Expression of functional index '%s' contains a disallowed function",
-	ErrFulltextFunctionalIndex:                               "Fulltext functional index is not supported",
-	ErrSpatialFunctionalIndex:                                "Spatial functional index is not supported",
+	ErrDataTruncatedFunctionalIndex:                          "Data truncated for expression index '%s' at row %d",
+	ErrDataOutOfRangeFunctionalIndex:                         "Value is out of range for expression index '%s' at row %d",
+	ErrFunctionalIndexOnJSONOrGeometryFunction:               "Cannot create an expression index on a function that returns a JSON or GEOMETRY value",
+	ErrFunctionalIndexRefAutoIncrement:                       "Expression index '%s' cannot refer to an auto-increment column",
+	ErrCannotDropColumnFunctionalIndex:                       "Cannot drop column '%s' because it is used by an expression index. In order to drop the column, you must remove the expression index",
+	ErrFunctionalIndexPrimaryKey:                             "The primary key cannot be an expression index",
+	ErrFunctionalIndexOnLob:                                  "Cannot create an expression index on an expression that returns a BLOB or TEXT. Please consider using CAST",
+	ErrFunctionalIndexFunctionIsNotAllowed:                   "Expression of expression index '%s' contains a disallowed function",
+	ErrFulltextFunctionalIndex:                               "Fulltext expression index is not supported",
+	ErrSpatialFunctionalIndex:                                "Spatial expression index is not supported",
 	ErrWrongKeyColumnFunctionalIndex:                         "The used storage engine cannot index the expression '%s'",
-	ErrFunctionalIndexOnField:                                "Functional index on a column is not supported. Consider using a regular index instead",
+	ErrFunctionalIndexOnField:                                "Expression index on a column is not supported. Consider using a regular index instead",
 	ErrFKIncompatibleColumns:                                 "Referencing column '%s' in foreign key constraint '%s' are incompatible",
-	ErrFunctionalIndexRowValueIsNotAllowed:                   "Expression of functional index '%s' cannot refer to a row value",
-	ErrDependentByFunctionalIndex:                            "Column '%s' has a functional index dependency and cannot be dropped or renamed",
-	ErrInvalidJSONValueForFuncIndex:                          "Invalid JSON value for CAST for functional index '%s'",
-	ErrJSONValueOutOfRangeForFuncIndex:                       "Out of range JSON value for CAST for functional index '%s'",
-	ErrFunctionalIndexDataIsTooLong:                          "Data too long for functional index '%s'",
-	ErrFunctionalIndexNotApplicable:                          "Cannot use functional index '%s' due to type or collation conversion",
+	ErrFunctionalIndexRowValueIsNotAllowed:                   "Expression of expression index '%s' cannot refer to a row value",
+	ErrDependentByFunctionalIndex:                            "Column '%s' has an expression index dependency and cannot be dropped or renamed",
+	ErrInvalidJSONValueForFuncIndex:                          "Invalid JSON value for CAST for expression index '%s'",
+	ErrJSONValueOutOfRangeForFuncIndex:                       "Out of range JSON value for CAST for expression index '%s'",
+	ErrFunctionalIndexDataIsTooLong:                          "Data too long for expression index '%s'",
+	ErrFunctionalIndexNotApplicable:                          "Cannot use expression index '%s' due to type or collation conversion",
 	ErrUnsupportedConstraintCheck:                            "%s is not supported",
 	// MariaDB errors.
 	ErrOnlyOneDefaultPartionAllowed:         "Only one DEFAULT partition allowed",
diff --git a/executor/adapter.go b/executor/adapter.go
index 823e196e7db44..2c8ff3c1a6a4d 100644
--- a/executor/adapter.go
+++ b/executor/adapter.go
@@ -387,19 +387,22 @@ func (a *ExecStmt) handleNoDelay(ctx context.Context, e Executor, isPessimistic
 	}()
 
 	toCheck := e
+	isExplainAnalyze := false
 	if explain, ok := e.(*ExplainExec); ok {
-		if explain.analyzeExec != nil {
-			toCheck = explain.analyzeExec
+		if analyze := explain.getAnalyzeExecToExecutedNoDelay(); analyze != nil {
+			toCheck = analyze
+			isExplainAnalyze = true
 		}
 	}
 
 	// If the executor doesn't return any result to the client, we execute it without delay.
 	if toCheck.Schema().Len() == 0 {
+		handled = !isExplainAnalyze
 		if isPessimistic {
-			return true, nil, a.handlePessimisticDML(ctx, e)
+			return handled, nil, a.handlePessimisticDML(ctx, toCheck)
 		}
-		r, err := a.handleNoDelayExecutor(ctx, e)
-		return true, r, err
+		r, err := a.handleNoDelayExecutor(ctx, toCheck)
+		return handled, r, err
 	} else if proj, ok := toCheck.(*ProjectionExec); ok && proj.calculateNoDelay {
 		// Currently this is only for the "DO" statement. Take "DO 1, @a=2;" as an example:
 		// the Projection has two expressions and two columns in the schema, but we should
@@ -589,6 +592,15 @@ func UpdateForUpdateTS(seCtx sessionctx.Context, newForUpdateTS uint64) error {
 	if !txn.Valid() {
 		return errors.Trace(kv.ErrInvalidTxn)
 	}
+
+	// The Oracle serializable isolation is actually SI in pessimistic mode.
+	// Do not update ForUpdateTS when the user is using the Serializable isolation level.
+	// It can be used temporarily on the few occasions when an Oracle-like isolation level is needed.
+	// Support for this does not mean that TiDB supports serializable isolation of MySQL.
+	// tidb_skip_isolation_level_check should still be disabled by default.
+	if seCtx.GetSessionVars().IsIsolation(ast.Serializable) {
+		return nil
+	}
 	if newForUpdateTS == 0 {
 		version, err := seCtx.GetStore().CurrentVersion()
 		if err != nil {
@@ -603,7 +615,11 @@ func UpdateForUpdateTS(seCtx sessionctx.Context, newForUpdateTS uint64) error {
 
 // handlePessimisticLockError updates TS and rebuild executor if the err is write conflict.
 func (a *ExecStmt) handlePessimisticLockError(ctx context.Context, err error) (Executor, error) {
-	txnCtx := a.Ctx.GetSessionVars().TxnCtx
+	sessVars := a.Ctx.GetSessionVars()
+	if err != nil && sessVars.IsIsolation(ast.Serializable) {
+		return nil, err
+	}
+	txnCtx := sessVars.TxnCtx
 	var newForUpdateTS uint64
 	if deadlock, ok := errors.Cause(err).(*tikv.ErrDeadlock); ok {
 		if !deadlock.IsRetryable {
diff --git a/executor/aggfuncs/aggfunc_test.go b/executor/aggfuncs/aggfunc_test.go
index d7dc3703dd4a9..d04ee889e4524 100644
--- a/executor/aggfuncs/aggfunc_test.go
+++ b/executor/aggfuncs/aggfunc_test.go
@@ -45,6 +45,11 @@ import (
 	"github.com/pingcap/tidb/util/set"
 )
 
+const (
+	// separator argument for group_concat() test cases
+	separator = " "
+)
+
 var _ = Suite(&testSuite{})
 
 func TestT(t *testing.T) {
@@ -264,9 +269,9 @@ func rowMemDeltaGens(srcChk *chunk.Chunk, dataType *types.FieldType) (memDeltas
 	return memDeltas, nil
 }
 
-type multiArgsUpdateMemDeltaGens func(*chunk.Chunk, []*types.FieldType) (memDeltas []int64, err error)
+type multiArgsUpdateMemDeltaGens func(*chunk.Chunk, []*types.FieldType, []*util.ByItems) (memDeltas []int64, err error)
 
-func defaultMultiArgsMemDeltaGens(srcChk *chunk.Chunk, dataTypes []*types.FieldType) (memDeltas []int64, err error) {
+func defaultMultiArgsMemDeltaGens(srcChk *chunk.Chunk, dataTypes []*types.FieldType, byItems []*util.ByItems) (memDeltas []int64, err error) {
 	memDeltas = make([]int64, 0)
 	m := make(map[string]bool)
 	for i := 0; i < srcChk.NumRows(); i++ {
@@ -342,14 +347,16 @@ type multiArgsAggMemTest struct {
 	multiArgsAggTest            multiArgsAggTest
 	allocMemDelta               int64
 	multiArgsUpdateMemDeltaGens multiArgsUpdateMemDeltaGens
+	isDistinct                  bool
 }
 
-func buildMultiArgsAggMemTester(funcName string, tps []byte, rt byte, numRows int, allocMemDelta int64, updateMemDeltaGens multiArgsUpdateMemDeltaGens, results ...interface{}) multiArgsAggMemTest {
-	multiArgsAggTest := buildMultiArgsAggTester(funcName, tps, rt, numRows, results...)
+func buildMultiArgsAggMemTester(funcName string, tps []byte, rt byte, numRows int, allocMemDelta int64, updateMemDeltaGens multiArgsUpdateMemDeltaGens, isDistinct bool) multiArgsAggMemTest {
+	multiArgsAggTest := buildMultiArgsAggTester(funcName, tps, rt, numRows)
 	pt := multiArgsAggMemTest{
 		multiArgsAggTest:            multiArgsAggTest,
 		allocMemDelta:               allocMemDelta,
 		multiArgsUpdateMemDeltaGens: updateMemDeltaGens,
+		isDistinct:                  isDistinct,
 	}
 	return pt
 }
@@ -360,7 +367,7 @@ func (s *testSuite) testMergePartialResult(c *C, p aggTest) {
 
 	args := []expression.Expression{&expression.Column{RetType: p.dataType, Index: 0}}
 	if p.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.funcName, args, false)
 	c.Assert(err, IsNil)
@@ -589,7 +596,7 @@ func (s *testSuite) testAggFunc(c *C, p aggTest) {
 
 	args := []expression.Expression{&expression.Column{RetType: p.dataType, Index: 0}}
 	if p.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 	if p.funcName == ast.AggFuncApproxPercentile {
 		args = append(args, &expression.Constant{Value: types.NewIntDatum(50), RetType: types.NewFieldType(mysql.TypeLong)})
@@ -670,7 +677,7 @@ func (s *testSuite) testAggMemFunc(c *C, p aggMemTest) {
 
 	args := []expression.Expression{&expression.Column{RetType: p.aggTest.dataType, Index: 0}}
 	if p.aggTest.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.aggTest.funcName, args, p.isDistinct)
 	c.Assert(err, IsNil)
@@ -703,7 +710,7 @@ func (s *testSuite) testMultiArgsAggFunc(c *C, p multiArgsAggTest) {
 		args[k] = &expression.Column{RetType: p.dataTypes[k], Index: k}
 	}
 	if p.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 
 	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.funcName, args, false)
@@ -785,10 +792,10 @@ func (s *testSuite) testMultiArgsAggMemFunc(c *C, p multiArgsAggMemTest) {
 		args[k] = &expression.Column{RetType: p.multiArgsAggTest.dataTypes[k], Index: k}
 	}
 	if p.multiArgsAggTest.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 
-	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.multiArgsAggTest.funcName, args, false)
+	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.multiArgsAggTest.funcName, args, p.isDistinct)
 	c.Assert(err, IsNil)
 	if p.multiArgsAggTest.orderBy {
 		desc.OrderByItems = []*util.ByItems{
@@ -799,8 +806,7 @@ func (s *testSuite) testMultiArgsAggMemFunc(c *C, p multiArgsAggMemTest) {
 	finalPr, memDelta := finalFunc.AllocPartialResult()
 	c.Assert(memDelta, Equals, p.allocMemDelta)
 
-	resultChk := chunk.NewChunkWithCapacity([]*types.FieldType{desc.RetTp}, 1)
-	updateMemDeltas, err := p.multiArgsUpdateMemDeltaGens(srcChk, p.multiArgsAggTest.dataTypes)
+	updateMemDeltas, err := p.multiArgsUpdateMemDeltaGens(srcChk, p.multiArgsAggTest.dataTypes, desc.OrderByItems)
 	c.Assert(err, IsNil)
 	iter := chunk.NewIterator4Chunk(srcChk)
 	i := 0
@@ -809,30 +815,6 @@ func (s *testSuite) testMultiArgsAggMemFunc(c *C, p multiArgsAggMemTest) {
 		c.Assert(memDelta, Equals, updateMemDeltas[i])
 		i++
 	}
-
-	// test the agg func with distinct
-	desc, err = aggregation.NewAggFuncDesc(s.ctx, p.multiArgsAggTest.funcName, args, true)
-	c.Assert(err, IsNil)
-	if p.multiArgsAggTest.orderBy {
-		desc.OrderByItems = []*util.ByItems{
-			{Expr: args[0], Desc: true},
-		}
-	}
-	finalFunc = aggfuncs.Build(s.ctx, desc, 0)
-	finalPr, memDelta = finalFunc.AllocPartialResult()
-	c.Assert(memDelta, Equals, p.allocMemDelta)
-
-	resultChk.Reset()
-	srcChk = p.multiArgsAggTest.genSrcChk()
-	updateMemDeltas, err = p.multiArgsUpdateMemDeltaGens(srcChk, p.multiArgsAggTest.dataTypes)
-	c.Assert(err, IsNil)
-	iter = chunk.NewIterator4Chunk(srcChk)
-	i = 0
-	for row := iter.Begin(); row != iter.End(); row = iter.Next() {
-		memDelta, _ := finalFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, finalPr)
-		c.Assert(memDelta, Equals, updateMemDeltas[i])
-		i++
-	}
 }
 
 func (s *testSuite) benchmarkAggFunc(b *testing.B, p aggTest) {
@@ -845,7 +827,7 @@ func (s *testSuite) benchmarkAggFunc(b *testing.B, p aggTest) {
 
 	args := []expression.Expression{&expression.Column{RetType: p.dataType, Index: 0}}
 	if p.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.funcName, args, false)
 	if err != nil {
@@ -898,7 +880,7 @@ func (s *testSuite) benchmarkMultiArgsAggFunc(b *testing.B, p multiArgsAggTest)
 		args[k] = &expression.Column{RetType: p.dataTypes[k], Index: k}
 	}
 	if p.funcName == ast.AggFuncGroupConcat {
-		args = append(args, &expression.Constant{Value: types.NewStringDatum(" "), RetType: types.NewFieldType(mysql.TypeString)})
+		args = append(args, &expression.Constant{Value: types.NewStringDatum(separator), RetType: types.NewFieldType(mysql.TypeString)})
 	}
 
 	desc, err := aggregation.NewAggFuncDesc(s.ctx, p.funcName, args, false)
diff --git a/executor/aggfuncs/func_count_distinct.go b/executor/aggfuncs/func_count_distinct.go
index 29f8338a9c19c..0dd974b390283 100644
--- a/executor/aggfuncs/func_count_distinct.go
+++ b/executor/aggfuncs/func_count_distinct.go
@@ -428,7 +428,8 @@ func appendDecimal(encodedBytes []byte, val *types.MyDecimal) ([]byte, error) {
 	return encodedBytes, err
 }
 
-func writeTime(buf []byte, t types.Time) {
+// WriteTime writes `t` into `buf`.
+func WriteTime(buf []byte, t types.Time) {
 	binary.BigEndian.PutUint16(buf, uint16(t.Year()))
 	buf[2] = uint8(t.Month())
 	buf[3] = uint8(t.Day())
@@ -438,10 +439,12 @@ func writeTime(buf []byte, t types.Time) {
 	binary.BigEndian.PutUint32(buf[8:], uint32(t.Microsecond()))
 	buf[12] = t.Type()
 	buf[13] = uint8(t.Fsp())
+
+	buf[7], buf[14], buf[15] = uint8(0), uint8(0), uint8(0)
 }
 
 func appendTime(encodedBytes, buf []byte, val types.Time) []byte {
-	writeTime(buf, val)
+	WriteTime(buf, val)
 	buf = buf[:16]
 	encodedBytes = append(encodedBytes, buf...)
 	return encodedBytes
diff --git a/executor/aggfuncs/func_count_test.go b/executor/aggfuncs/func_count_test.go
index eb6bf296dd743..3b6898a8cdedb 100644
--- a/executor/aggfuncs/func_count_test.go
+++ b/executor/aggfuncs/func_count_test.go
@@ -22,6 +22,8 @@ import (
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/executor/aggfuncs"
+	"github.com/pingcap/tidb/sessionctx/stmtctx"
+	"github.com/pingcap/tidb/types"
 )
 
 func genApproxDistinctMergePartialResult(begin, end uint64) string {
@@ -143,6 +145,20 @@ func (s *testSuite) TestMemCount(c *C) {
 	}
 }
 
+func (s *testSuite) TestWriteTime(c *C) {
+	t, err := types.ParseDate(&(stmtctx.StatementContext{}), "2020-11-11")
+	c.Assert(err, IsNil)
+
+	buf := make([]byte, 16)
+	for i := range buf {
+		buf[i] = uint8(255)
+	}
+	aggfuncs.WriteTime(buf, t)
+	for i := range buf {
+		c.Assert(buf[i] == uint8(255), IsFalse)
+	}
+}
+
 func BenchmarkCount(b *testing.B) {
 	s := testSuite{}
 	s.SetUpSuite(nil)
diff --git a/executor/aggfuncs/func_group_concat.go b/executor/aggfuncs/func_group_concat.go
index 1e4b24bab45ca..0e2be59856eb2 100644
--- a/executor/aggfuncs/func_group_concat.go
+++ b/executor/aggfuncs/func_group_concat.go
@@ -18,6 +18,7 @@ import (
 	"container/heap"
 	"sort"
 	"sync/atomic"
+	"unsafe"
 
 	"github.com/pingcap/parser/terror"
 	mysql "github.com/pingcap/tidb/errno"
@@ -31,6 +32,17 @@ import (
 	"github.com/pingcap/tidb/util/set"
 )
 
+const (
+	// DefPartialResult4GroupConcatSize is the size of partialResult4GroupConcat
+	DefPartialResult4GroupConcatSize = int64(unsafe.Sizeof(partialResult4GroupConcat{}))
+	// DefPartialResult4GroupConcatDistinctSize is the size of partialResult4GroupConcatDistinct
+	DefPartialResult4GroupConcatDistinctSize = int64(unsafe.Sizeof(partialResult4GroupConcatDistinct{}))
+	// DefPartialResult4GroupConcatOrderSize is the size of partialResult4GroupConcatOrder
+	DefPartialResult4GroupConcatOrderSize = int64(unsafe.Sizeof(partialResult4GroupConcatOrder{}))
+	// DefPartialResult4GroupConcatOrderDistinctSize is the size of partialResult4GroupConcatOrderDistinct
+	DefPartialResult4GroupConcatOrderDistinctSize = int64(unsafe.Sizeof(partialResult4GroupConcatOrderDistinct{}))
+)
+
 type baseGroupConcat4String struct {
 	baseAggFunc
 	byItems []*util.ByItems
@@ -87,7 +99,7 @@ type groupConcat struct {
 func (e *groupConcat) AllocPartialResult() (pr PartialResult, memDelta int64) {
 	p := new(partialResult4GroupConcat)
 	p.valsBuf = &bytes.Buffer{}
-	return PartialResult(p), 0
+	return PartialResult(p), DefPartialResult4GroupConcatSize
 }
 
 func (e *groupConcat) ResetPartialResult(pr PartialResult) {
@@ -103,7 +115,7 @@ func (e *groupConcat) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup [
 		for _, arg := range e.args {
 			v, isNull, err = arg.EvalString(sctx, row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			if isNull {
 				break
@@ -113,17 +125,21 @@ func (e *groupConcat) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup [
 		if isNull {
 			continue
 		}
+		var oldMem int
 		if p.buffer == nil {
 			p.buffer = &bytes.Buffer{}
 		} else {
+			oldMem = p.buffer.Cap()
 			p.buffer.WriteString(e.sep)
 		}
 		p.buffer.WriteString(p.valsBuf.String())
+		newMem := p.buffer.Cap()
+		memDelta += int64(newMem - oldMem)
 	}
 	if p.buffer != nil {
-		return 0, e.truncatePartialResultIfNeed(sctx, p.buffer)
+		return memDelta, e.truncatePartialResultIfNeed(sctx, p.buffer)
 	}
-	return 0, nil
+	return memDelta, nil
 }
 
 func (e *groupConcat) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) (memDelta int64, err error) {
@@ -164,7 +180,7 @@ func (e *groupConcatDistinct) AllocPartialResult() (pr PartialResult, memDelta i
 	p := new(partialResult4GroupConcatDistinct)
 	p.valsBuf = &bytes.Buffer{}
 	p.valSet = set.NewStringSet()
-	return PartialResult(p), 0
+	return PartialResult(p), DefPartialResult4GroupConcatDistinctSize
 }
 
 func (e *groupConcatDistinct) ResetPartialResult(pr PartialResult) {
@@ -181,7 +197,7 @@ func (e *groupConcatDistinct) UpdatePartialResult(sctx sessionctx.Context, rowsI
 		for _, arg := range e.args {
 			v, isNull, err = arg.EvalString(sctx, row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			if isNull {
 				break
@@ -197,19 +213,24 @@ func (e *groupConcatDistinct) UpdatePartialResult(sctx sessionctx.Context, rowsI
 			continue
 		}
 		p.valSet.Insert(joinedVal)
+		memDelta += int64(len(joinedVal))
+		var oldMem int
 		// write separator
 		if p.buffer == nil {
 			p.buffer = &bytes.Buffer{}
 		} else {
+			oldMem = p.buffer.Cap()
 			p.buffer.WriteString(e.sep)
 		}
 		// write values
 		p.buffer.WriteString(p.valsBuf.String())
+		newMem := p.buffer.Cap()
+		memDelta += int64(newMem - oldMem)
 	}
 	if p.buffer != nil {
-		return 0, e.truncatePartialResultIfNeed(sctx, p.buffer)
+		return memDelta, e.truncatePartialResultIfNeed(sctx, p.buffer)
 	}
-	return 0, nil
+	return memDelta, nil
 }
 
 // SetTruncated will be called in `executorBuilder#buildHashAgg` with duck-type.
@@ -278,14 +299,19 @@ func (h *topNRows) Pop() interface{} {
 	return x
 }
 
-func (h *topNRows) tryToAdd(row sortRow) (truncated bool) {
+func (h *topNRows) tryToAdd(row sortRow) (truncated bool, sortRowMemSize int64) {
+	oldSize := h.currSize
 	h.currSize += uint64(row.buffer.Len())
 	if len(h.rows) > 0 {
 		h.currSize += h.sepSize
 	}
 	heap.Push(h, row)
+	for _, dt := range row.byItems {
+		sortRowMemSize += GetDatumMemSize(dt)
+	}
 	if h.currSize <= h.limitSize {
-		return false
+		sortRowMemSize += int64(h.currSize - oldSize)
+		return false, sortRowMemSize
 	}
 
 	for h.currSize > h.limitSize {
@@ -295,10 +321,14 @@ func (h *topNRows) tryToAdd(row sortRow) (truncated bool) {
 			h.rows[0].buffer.Truncate(h.rows[0].buffer.Len() - int(debt))
 		} else {
 			h.currSize -= uint64(h.rows[0].buffer.Len()) + h.sepSize
+			for _, dt := range h.rows[0].byItems {
+				sortRowMemSize -= GetDatumMemSize(dt)
+			}
 			heap.Pop(h)
 		}
 	}
-	return true
+	sortRowMemSize += int64(h.currSize - oldSize)
+	return true, sortRowMemSize
 }
 
 func (h *topNRows) reset() {
@@ -355,7 +385,7 @@ func (e *groupConcatOrder) AllocPartialResult() (pr PartialResult, memDelta int6
 			sepSize:   uint64(len(e.sep)),
 		},
 	}
-	return PartialResult(p), 0
+	return PartialResult(p), DefPartialResult4GroupConcatOrderSize
 }
 
 func (e *groupConcatOrder) ResetPartialResult(pr PartialResult) {
@@ -372,7 +402,7 @@ func (e *groupConcatOrder) UpdatePartialResult(sctx sessionctx.Context, rowsInGr
 		for _, arg := range e.args {
 			v, isNull, err = arg.EvalString(sctx, row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			if isNull {
 				break
@@ -389,21 +419,22 @@ func (e *groupConcatOrder) UpdatePartialResult(sctx sessionctx.Context, rowsInGr
 		for _, byItem := range e.byItems {
 			d, err := byItem.Expr.Eval(row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			sortRow.byItems = append(sortRow.byItems, d.Clone())
 		}
-		truncated := p.topN.tryToAdd(sortRow)
+		truncated, sortRowMemSize := p.topN.tryToAdd(sortRow)
+		memDelta += sortRowMemSize
 		if p.topN.err != nil {
-			return 0, p.topN.err
+			return memDelta, p.topN.err
 		}
 		if truncated {
 			if err := e.handleTruncateError(sctx); err != nil {
-				return 0, err
+				return memDelta, err
 			}
 		}
 	}
-	return 0, nil
+	return memDelta, nil
 }
 
 func (e *groupConcatOrder) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) (memDelta int64, err error) {
@@ -456,7 +487,7 @@ func (e *groupConcatDistinctOrder) AllocPartialResult() (pr PartialResult, memDe
 		},
 		valSet: set.NewStringSet(),
 	}
-	return PartialResult(p), 0
+	return PartialResult(p), DefPartialResult4GroupConcatOrderDistinctSize
 }
 
 func (e *groupConcatDistinctOrder) ResetPartialResult(pr PartialResult) {
@@ -475,7 +506,7 @@ func (e *groupConcatDistinctOrder) UpdatePartialResult(sctx sessionctx.Context,
 		for _, arg := range e.args {
 			v, isNull, err = arg.EvalString(sctx, row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			if isNull {
 				break
@@ -498,21 +529,23 @@ func (e *groupConcatDistinctOrder) UpdatePartialResult(sctx sessionctx.Context,
 		for _, byItem := range e.byItems {
 			d, err := byItem.Expr.Eval(row)
 			if err != nil {
-				return 0, err
+				return memDelta, err
 			}
 			sortRow.byItems = append(sortRow.byItems, d.Clone())
 		}
-		truncated := p.topN.tryToAdd(sortRow)
+		truncated, sortRowMemSize := p.topN.tryToAdd(sortRow)
+		memDelta += sortRowMemSize
+		memDelta += int64(len(joinedVal))
 		if p.topN.err != nil {
-			return 0, p.topN.err
+			return memDelta, p.topN.err
 		}
 		if truncated {
 			if err := e.handleTruncateError(sctx); err != nil {
-				return 0, err
+				return memDelta, err
 			}
 		}
 	}
-	return 0, nil
+	return memDelta, nil
 }
 
 func (e *groupConcatDistinctOrder) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) (memDelta int64, err error) {
@@ -520,3 +553,14 @@ func (e *groupConcatDistinctOrder) MergePartialResult(sctx sessionctx.Context, s
 	// So MergePartialResult will not be called.
 	return 0, terror.ClassOptimizer.New(mysql.ErrInternal, mysql.MySQLErrName[mysql.ErrInternal]).GenWithStack("groupConcatDistinctOrder.MergePartialResult should not be called")
 }
+
+// GetDatumMemSize calculates the memory size of each types.Datum in sortRow.byItems.
+// types.Datum memory size = variable type's memory size + variable value's memory size.
+func GetDatumMemSize(d *types.Datum) int64 {
+	var datumMemSize int64
+	datumMemSize += int64(unsafe.Sizeof(*d))
+	datumMemSize += int64(len(d.Collation()))
+	datumMemSize += int64(len(d.GetBytes()))
+	datumMemSize += getValMemDelta(d.GetInterface()) - DefInterfaceSize
+	return datumMemSize
+}
diff --git a/executor/aggfuncs/func_group_concat_test.go b/executor/aggfuncs/func_group_concat_test.go
index 7e68e93cfed3b..76051d99b09ad 100644
--- a/executor/aggfuncs/func_group_concat_test.go
+++ b/executor/aggfuncs/func_group_concat_test.go
@@ -14,13 +14,20 @@
 package aggfuncs_test
 
 import (
+	"bytes"
 	"fmt"
 
 	. "github.com/pingcap/check"
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/mysql"
+	"github.com/pingcap/tidb/executor/aggfuncs"
+	"github.com/pingcap/tidb/planner/util"
 	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/types"
+	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/codec"
+	"github.com/pingcap/tidb/util/hack"
+	"github.com/pingcap/tidb/util/set"
 )
 
 func (s *testSuite) TestMergePartialResult4GroupConcat(c *C) {
@@ -45,3 +52,148 @@ func (s *testSuite) TestGroupConcat(c *C) {
 		s.testMultiArgsAggFunc(c, test2)
 	}
 }
+
+func (s *testSuite) TestMemGroupConcat(c *C) {
+	multiArgsTest1 := buildMultiArgsAggMemTester(ast.AggFuncGroupConcat, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeString, 5,
+		aggfuncs.DefPartialResult4GroupConcatSize, groupConcatMultiArgsUpdateMemDeltaGens, false)
+	multiArgsTest2 := buildMultiArgsAggMemTester(ast.AggFuncGroupConcat, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeString, 5,
+		aggfuncs.DefPartialResult4GroupConcatDistinctSize, groupConcatDistinctMultiArgsUpdateMemDeltaGens, true)
+
+	multiArgsTest3 := buildMultiArgsAggMemTester(ast.AggFuncGroupConcat, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeString, 5,
+		aggfuncs.DefPartialResult4GroupConcatOrderSize, groupConcatOrderMultiArgsUpdateMemDeltaGens, false)
+	multiArgsTest3.multiArgsAggTest.orderBy = true
+	multiArgsTest4 := buildMultiArgsAggMemTester(ast.AggFuncGroupConcat, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeString, 5,
+		aggfuncs.DefPartialResult4GroupConcatOrderDistinctSize, groupConcatDistinctOrderMultiArgsUpdateMemDeltaGens, true)
+	multiArgsTest4.multiArgsAggTest.orderBy = true
+
+	multiArgsTests := []multiArgsAggMemTest{multiArgsTest1, multiArgsTest2, multiArgsTest3, multiArgsTest4}
+	for _, test := range multiArgsTests {
+		s.testMultiArgsAggMemFunc(c, test)
+	}
+}
+
+func groupConcatMultiArgsUpdateMemDeltaGens(srcChk *chunk.Chunk, dataType []*types.FieldType, byItems []*util.ByItems) (memDeltas []int64, err error) {
+	memDeltas = make([]int64, 0)
+	buffer := new(bytes.Buffer)
+	for i := 0; i < srcChk.NumRows(); i++ {
+		row := srcChk.GetRow(i)
+		if row.IsNull(0) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		oldMemSize := buffer.Cap()
+		if i != 0 {
+			buffer.WriteString(separator)
+		}
+		for j := 0; j < len(dataType); j++ {
+			curVal := row.GetString(j)
+			buffer.WriteString(curVal)
+		}
+		memDelta := int64(buffer.Cap() - oldMemSize)
+		memDeltas = append(memDeltas, memDelta)
+	}
+	return memDeltas, nil
+}
+
+func groupConcatOrderMultiArgsUpdateMemDeltaGens(srcChk *chunk.Chunk, dataType []*types.FieldType, byItems []*util.ByItems) (memDeltas []int64, err error) {
+	memDeltas = make([]int64, 0)
+	buffer := new(bytes.Buffer)
+	for i := 0; i < srcChk.NumRows(); i++ {
+		row := srcChk.GetRow(i)
+		if row.IsNull(0) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		oldMemSize := buffer.Len()
+		if i != 0 {
+			buffer.WriteString(separator)
+		}
+		for j := 0; j < len(dataType); j++ {
+			curVal := row.GetString(j)
+			buffer.WriteString(curVal)
+		}
+		memDelta := int64(buffer.Len() - oldMemSize)
+		for _, byItem := range byItems {
+			fdt, _ := byItem.Expr.Eval(row)
+			datumMem := aggfuncs.GetDatumMemSize(&fdt)
+			memDelta += datumMem
+		}
+		memDeltas = append(memDeltas, memDelta)
+	}
+	return memDeltas, nil
+}
+
+func groupConcatDistinctMultiArgsUpdateMemDeltaGens(srcChk *chunk.Chunk, dataType []*types.FieldType, byItems []*util.ByItems) (memDeltas []int64, err error) {
+	valSet := set.NewStringSet()
+	buffer := new(bytes.Buffer)
+	valsBuf := new(bytes.Buffer)
+	var encodeBytesBuffer []byte
+	for i := 0; i < srcChk.NumRows(); i++ {
+		row := srcChk.GetRow(i)
+		if row.IsNull(0) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		valsBuf.Reset()
+		encodeBytesBuffer = encodeBytesBuffer[:0]
+		for j := 0; j < len(dataType); j++ {
+			curVal := row.GetString(j)
+			encodeBytesBuffer = codec.EncodeBytes(encodeBytesBuffer, hack.Slice(curVal))
+			valsBuf.WriteString(curVal)
+		}
+		joinedVal := string(encodeBytesBuffer)
+		if valSet.Exist(joinedVal) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		valSet.Insert(joinedVal)
+		oldMemSize := buffer.Cap()
+		if i != 0 {
+			buffer.WriteString(separator)
+		}
+		buffer.WriteString(valsBuf.String())
+		memDelta := int64(len(joinedVal) + (buffer.Cap() - oldMemSize))
+		memDeltas = append(memDeltas, memDelta)
+	}
+	return memDeltas, nil
+}
+
+func groupConcatDistinctOrderMultiArgsUpdateMemDeltaGens(srcChk *chunk.Chunk, dataType []*types.FieldType, byItems []*util.ByItems) (memDeltas []int64, err error) {
+	valSet := set.NewStringSet()
+	buffer := new(bytes.Buffer)
+	valsBuf := new(bytes.Buffer)
+	var encodeBytesBuffer []byte
+	for i := 0; i < srcChk.NumRows(); i++ {
+		row := srcChk.GetRow(i)
+		if row.IsNull(0) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		valsBuf.Reset()
+		encodeBytesBuffer = encodeBytesBuffer[:0]
+		for j := 0; j < len(dataType); j++ {
+			curVal := row.GetString(j)
+			encodeBytesBuffer = codec.EncodeBytes(encodeBytesBuffer, hack.Slice(curVal))
+			valsBuf.WriteString(curVal)
+		}
+		joinedVal := string(encodeBytesBuffer)
+		if valSet.Exist(joinedVal) {
+			memDeltas = append(memDeltas, int64(0))
+			continue
+		}
+		oldMemSize := buffer.Len()
+		if i != 0 {
+			buffer.WriteString(separator)
+		}
+		valSet.Insert(joinedVal)
+		buffer.WriteString(valsBuf.String())
+		memDelta := int64(len(joinedVal) + (buffer.Len() - oldMemSize))
+		for _, byItem := range byItems {
+			fdt, _ := byItem.Expr.Eval(row)
+			datumMem := aggfuncs.GetDatumMemSize(&fdt)
+			memDelta += datumMem
+		}
+		memDeltas = append(memDeltas, memDelta)
+	}
+	return memDeltas, nil
+}
diff --git a/executor/aggfuncs/func_json_objectagg_test.go b/executor/aggfuncs/func_json_objectagg_test.go
index 2a424b6831109..aea5d0a29581e 100644
--- a/executor/aggfuncs/func_json_objectagg_test.go
+++ b/executor/aggfuncs/func_json_objectagg_test.go
@@ -113,10 +113,7 @@ func (s *testSuite) TestMemJsonObjectagg(c *C) {
 			argCombines = append(argCombines, argTypes)
 		}
 	}
-
-	var tests []multiArgsAggMemTest
 	numRows := 5
-
 	for k := 0; k < len(argCombines); k++ {
 		entries := make(map[string]interface{})
 
@@ -143,12 +140,12 @@ func (s *testSuite) TestMemJsonObjectagg(c *C) {
 			}
 		}
 
-		aggTest := buildMultiArgsAggMemTester(ast.AggFuncJsonObjectAgg, argTypes, mysql.TypeJSON, numRows, aggfuncs.DefPartialResult4JsonObjectAgg, defaultMultiArgsMemDeltaGens, nil, json.CreateBinary(entries))
-
-		tests = append(tests, aggTest)
-	}
-
-	for _, test := range tests {
-		s.testMultiArgsAggMemFunc(c, test)
+		tests := []multiArgsAggMemTest{
+			buildMultiArgsAggMemTester(ast.AggFuncJsonObjectAgg, argTypes, mysql.TypeJSON, numRows, aggfuncs.DefPartialResult4JsonObjectAgg, defaultMultiArgsMemDeltaGens, true),
+			buildMultiArgsAggMemTester(ast.AggFuncJsonObjectAgg, argTypes, mysql.TypeJSON, numRows, aggfuncs.DefPartialResult4JsonObjectAgg, defaultMultiArgsMemDeltaGens, false),
+		}
+		for _, test := range tests {
+			s.testMultiArgsAggMemFunc(c, test)
+		}
 	}
 }
diff --git a/executor/analyze.go b/executor/analyze.go
old mode 100755
new mode 100644
diff --git a/executor/builder.go b/executor/builder.go
index cbedfc175399b..9454f207bb3eb 100644
--- a/executor/builder.go
+++ b/executor/builder.go
@@ -2482,7 +2482,7 @@ func buildNoRangeTableReader(b *executorBuilder, v *plannercore.PhysicalTableRea
 	if containsLimit(dagReq.Executors) {
 		e.feedback = statistics.NewQueryFeedback(0, nil, 0, ts.Desc)
 	} else {
-		e.feedback = statistics.NewQueryFeedback(getPhysicalTableID(tbl), ts.Hist, int64(ts.StatsCount()), ts.Desc)
+		e.feedback = statistics.NewQueryFeedback(getFeedbackStatsTableID(e.ctx, tbl), ts.Hist, int64(ts.StatsCount()), ts.Desc)
 	}
 	collect := statistics.CollectFeedback(b.ctx.GetSessionVars().StmtCtx, e.feedback, len(ts.Ranges))
 	if !collect {
@@ -2738,7 +2738,11 @@ func buildNoRangeIndexReader(b *executorBuilder, v *plannercore.PhysicalIndexRea
 	if containsLimit(dagReq.Executors) {
 		e.feedback = statistics.NewQueryFeedback(0, nil, 0, is.Desc)
 	} else {
-		e.feedback = statistics.NewQueryFeedback(e.physicalTableID, is.Hist, int64(is.StatsCount()), is.Desc)
+		tblID := e.physicalTableID
+		if b.ctx.GetSessionVars().UseDynamicPartitionPrune() {
+			tblID = e.table.Meta().ID
+		}
+		e.feedback = statistics.NewQueryFeedback(tblID, is.Hist, int64(is.StatsCount()), is.Desc)
 	}
 	collect := statistics.CollectFeedback(b.ctx.GetSessionVars().StmtCtx, e.feedback, len(is.Ranges))
 	if !collect {
@@ -2875,7 +2879,7 @@ func buildNoRangeIndexLookUpReader(b *executorBuilder, v *plannercore.PhysicalIn
 	if containsLimit(indexReq.Executors) {
 		e.feedback = statistics.NewQueryFeedback(0, nil, 0, is.Desc)
 	} else {
-		e.feedback = statistics.NewQueryFeedback(getPhysicalTableID(tbl), is.Hist, int64(is.StatsCount()), is.Desc)
+		e.feedback = statistics.NewQueryFeedback(getFeedbackStatsTableID(e.ctx, tbl), is.Hist, int64(is.StatsCount()), is.Desc)
 	}
 	// Do not collect the feedback for table request.
 	collectTable := false
@@ -3779,6 +3783,13 @@ func getPhysicalTableID(t table.Table) int64 {
 	return t.Meta().ID
 }
 
+func getFeedbackStatsTableID(ctx sessionctx.Context, t table.Table) int64 {
+	if p, ok := t.(table.PhysicalTable); ok && !ctx.GetSessionVars().UseDynamicPartitionPrune() {
+		return p.GetPhysicalID()
+	}
+	return t.Meta().ID
+}
+
 func (b *executorBuilder) buildAdminShowTelemetry(v *plannercore.AdminShowTelemetry) Executor {
 	return &AdminShowTelemetryExec{baseExecutor: newBaseExecutor(b.ctx, v.Schema(), v.ID())}
 }
diff --git a/executor/ddl.go b/executor/ddl.go
index ae2d685a65ccf..e731d658c5d36 100644
--- a/executor/ddl.go
+++ b/executor/ddl.go
@@ -122,7 +122,8 @@ func (e *DDLExec) Next(ctx context.Context, req *chunk.Chunk) (err error) {
 		err = e.executeCreateSequence(x)
 	case *ast.DropSequenceStmt:
 		err = e.executeDropSequence(x)
-
+	case *ast.AlterSequenceStmt:
+		err = e.executeAlterSequence(x)
 	}
 	if err != nil {
 		// If the owner return ErrTableNotExists error when running this DDL, it may be caused by schema changed,
@@ -608,3 +609,7 @@ func (e *DDLExec) executeRepairTable(s *ast.RepairTableStmt) error {
 func (e *DDLExec) executeCreateSequence(s *ast.CreateSequenceStmt) error {
 	return domain.GetDomain(e.ctx).DDL().CreateSequence(e.ctx, s)
 }
+
+func (e *DDLExec) executeAlterSequence(s *ast.AlterSequenceStmt) error {
+	return domain.GetDomain(e.ctx).DDL().AlterSequence(e.ctx, s)
+}
diff --git a/executor/ddl_test.go b/executor/ddl_test.go
index eec049e51f3d1..eca31b0c5c525 100644
--- a/executor/ddl_test.go
+++ b/executor/ddl_test.go
@@ -1426,3 +1426,16 @@ func (s *testRecoverTable) TestRenameTable(c *C) {
 	tk.MustExec("drop database rename1")
 	tk.MustExec("drop database rename2")
 }
+
+func (s *testSuite6) TestAutoIncrementColumnErrorMessage(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	// Test create an exist database
+	_, err := tk.Exec("CREATE database test")
+	c.Assert(err, NotNil)
+
+	tk.MustExec("CREATE TABLE t1 (t1_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY);")
+
+	_, err = tk.Exec("CREATE INDEX idx1 ON t1 ((t1_id + t1_id));")
+	c.Assert(err.Error(), Equals, ddl.ErrExpressionIndexCanNotRefer.GenWithStackByArgs("idx1").Error())
+}
diff --git a/executor/executor_pkg_test.go b/executor/executor_pkg_test.go
index bca52e2632bb5..a95f12b69788c 100644
--- a/executor/executor_pkg_test.go
+++ b/executor/executor_pkg_test.go
@@ -16,6 +16,7 @@ package executor
 import (
 	"context"
 	"crypto/tls"
+	"time"
 
 	. "github.com/pingcap/check"
 	"github.com/pingcap/failpoint"
@@ -390,3 +391,19 @@ func (s *testExecSerialSuite) TestSortSpillDisk(c *C) {
 	err = exec.Close()
 	c.Assert(err, IsNil)
 }
+
+func (s *pkgTestSuite) TestSlowQueryRuntimeStats(c *C) {
+	stats := &slowQueryRuntimeStats{
+		totalFileNum: 2,
+		readFileNum:  2,
+		readFile:     time.Second,
+		initialize:   time.Millisecond,
+		readFileSize: 1024 * 1024 * 1024,
+		parseLog:     int64(time.Millisecond * 100),
+		concurrent:   15,
+	}
+	c.Assert(stats.String(), Equals, "initialize: 1ms, read_file: 1s, parse_log: {time:100ms, concurrency:15}, total_file: 2, read_file: 2, read_size: 1024 MB")
+	c.Assert(stats.String(), Equals, stats.Clone().String())
+	stats.Merge(stats.Clone())
+	c.Assert(stats.String(), Equals, "initialize: 2ms, read_file: 2s, parse_log: {time:200ms, concurrency:15}, total_file: 4, read_file: 4, read_size: 2 GB")
+}
diff --git a/executor/executor_test.go b/executor/executor_test.go
index a33b72ff75655..75b700129db57 100644
--- a/executor/executor_test.go
+++ b/executor/executor_test.go
@@ -4053,6 +4053,32 @@ func (s *testSuite3) TestDoSubquery(c *C) {
 	c.Assert(r, IsNil, Commentf("result of Do not empty"))
 }
 
+func (s *testSuite3) TestSubqueryTableAlias(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec(`use test`)
+	tk.MustExec(`drop table if exists t`)
+
+	tk.MustExec("set sql_mode = ''")
+	tk.MustGetErrCode("select a, b from (select 1 a) ``, (select 2 b) ``;", mysql.ErrDerivedMustHaveAlias)
+	tk.MustGetErrCode("select a, b from (select 1 a) `x`, (select 2 b) `x`;", mysql.ErrNonuniqTable)
+	tk.MustGetErrCode("select a, b from (select 1 a), (select 2 b);", mysql.ErrDerivedMustHaveAlias)
+	// ambiguous column name
+	tk.MustGetErrCode("select a from (select 1 a) ``, (select 2 a) ``;", mysql.ErrDerivedMustHaveAlias)
+	tk.MustGetErrCode("select a from (select 1 a) `x`, (select 2 a) `x`;", mysql.ErrNonuniqTable)
+	tk.MustGetErrCode("select x.a from (select 1 a) `x`, (select 2 a) `x`;", mysql.ErrNonuniqTable)
+	tk.MustGetErrCode("select a from (select 1 a), (select 2 a);", mysql.ErrDerivedMustHaveAlias)
+
+	tk.MustExec("set sql_mode = 'oracle';")
+	tk.MustQuery("select a, b from (select 1 a) ``, (select 2 b) ``;").Check(testkit.Rows("1 2"))
+	tk.MustQuery("select a, b from (select 1 a) `x`, (select 2 b) `x`;").Check(testkit.Rows("1 2"))
+	tk.MustQuery("select a, b from (select 1 a), (select 2 b);").Check(testkit.Rows("1 2"))
+	// ambiguous column name
+	tk.MustGetErrCode("select a from (select 1 a) ``, (select 2 a) ``;", mysql.ErrNonUniq)
+	tk.MustGetErrCode("select a from (select 1 a) `x`, (select 2 a) `x`;", mysql.ErrNonUniq)
+	tk.MustGetErrCode("select x.a from (select 1 a) `x`, (select 2 a) `x`;", mysql.ErrNonUniq)
+	tk.MustGetErrCode("select a from (select 1 a), (select 2 a);", mysql.ErrNonUniq)
+}
+
 func (s *testSerialSuite) TestTSOFail(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec(`use test`)
@@ -6527,3 +6553,27 @@ func (s *testSerialSuite) TestCoprocessorOOMAction(c *C) {
 		se.Close()
 	}
 }
+
+func (s *testSuite) TestIssue20237(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t, s")
+	tk.MustExec("create table t(a date, b float)")
+	tk.MustExec("create table s(b float)")
+	tk.MustExec(`insert into t values(NULL,-37), ("2011-11-04",105), ("2013-03-02",-22), ("2006-07-02",-56), (NULL,124), (NULL,111), ("2018-03-03",-5);`)
+	tk.MustExec(`insert into s values(-37),(105),(-22),(-56),(124),(105),(111),(-5);`)
+	tk.MustQuery(`select count(distinct t.a, t.b) from t join s on t.b= s.b;`).Check(testkit.Rows("4"))
+}
+
+func (s *testSerialSuite) TestIssue19148(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a decimal(16, 2));")
+	tk.MustExec("select * from t where a > any_value(a);")
+	ctx := tk.Se.(sessionctx.Context)
+	is := domain.GetDomain(ctx).InfoSchema()
+	tblInfo, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+	c.Assert(err, IsNil)
+	c.Assert(int(tblInfo.Meta().Columns[0].Flag), Equals, 0)
+}
diff --git a/executor/explain.go b/executor/explain.go
index 2e12fd9d417b2..5547573272c10 100644
--- a/executor/explain.go
+++ b/executor/explain.go
@@ -28,6 +28,7 @@ type ExplainExec struct {
 
 	explain     *core.Explain
 	analyzeExec Executor
+	executed    bool
 	rows        [][]string
 	cursor      int
 }
@@ -71,37 +72,33 @@ func (e *ExplainExec) Next(ctx context.Context, req *chunk.Chunk) error {
 	return nil
 }
 
-func (e *ExplainExec) generateExplainInfo(ctx context.Context) (rows [][]string, err error) {
-	closed := false
-	defer func() {
-		if !closed && e.analyzeExec != nil {
-			err = e.analyzeExec.Close()
-			closed = true
-		}
-	}()
-	if e.analyzeExec != nil {
+func (e *ExplainExec) executeAnalyzeExec(ctx context.Context) (err error) {
+	if e.analyzeExec != nil && !e.executed {
+		defer func() {
+			err1 := e.analyzeExec.Close()
+			if err1 != nil {
+				if err != nil {
+					err = errors.New(err.Error() + ", " + err1.Error())
+				} else {
+					err = err1
+				}
+			}
+		}()
+		e.executed = true
 		chk := newFirstChunk(e.analyzeExec)
-		var nextErr, closeErr error
 		for {
-			nextErr = Next(ctx, e.analyzeExec, chk)
-			if nextErr != nil || chk.NumRows() == 0 {
+			err = Next(ctx, e.analyzeExec, chk)
+			if err != nil || chk.NumRows() == 0 {
 				break
 			}
 		}
-		closeErr = e.analyzeExec.Close()
-		closed = true
-		if nextErr != nil {
-			if closeErr != nil {
-				err = errors.New(nextErr.Error() + ", " + closeErr.Error())
-			} else {
-				err = nextErr
-			}
-		} else if closeErr != nil {
-			err = closeErr
-		}
-		if err != nil {
-			return nil, err
-		}
+	}
+	return err
+}
+
+func (e *ExplainExec) generateExplainInfo(ctx context.Context) (rows [][]string, err error) {
+	if err = e.executeAnalyzeExec(ctx); err != nil {
+		return nil, err
 	}
 	if err = e.explain.RenderResult(); err != nil {
 		return nil, err
@@ -111,3 +108,16 @@ func (e *ExplainExec) generateExplainInfo(ctx context.Context) (rows [][]string,
 	}
 	return e.explain.Rows, nil
 }
+
+// getAnalyzeExecToExecutedNoDelay gets the analyze DML executor to execute in handleNoDelay function.
+// For explain analyze insert/update/delete statement, the analyze executor should be executed in handleNoDelay
+// function and then commit transaction if needed.
+// Otherwise, in autocommit transaction, the table record change of analyze executor(insert/update/delete...)
+// will not be committed.
+func (e *ExplainExec) getAnalyzeExecToExecutedNoDelay() Executor {
+	if e.analyzeExec != nil && !e.executed && e.analyzeExec.Schema().Len() == 0 {
+		e.executed = true
+		return e.analyzeExec
+	}
+	return nil
+}
diff --git a/executor/explain_test.go b/executor/explain_test.go
index b73d33e4870f8..e8e108e3580c3 100644
--- a/executor/explain_test.go
+++ b/executor/explain_test.go
@@ -93,14 +93,15 @@ func (s *testSuite1) TestExplainWrite(c *C) {
 	tk := testkit.NewTestKitWithInit(c, s.store)
 	tk.MustExec("drop table if exists t")
 	tk.MustExec("create table t (a int)")
-	tk.MustExec("explain analyze insert into t select 1")
+	tk.MustQuery("explain analyze insert into t select 1")
 	tk.MustQuery("select * from t").Check(testkit.Rows("1"))
-	tk.MustExec("explain analyze update t set a=2 where a=1")
+	tk.MustQuery("explain analyze update t set a=2 where a=1")
 	tk.MustQuery("select * from t").Check(testkit.Rows("2"))
-	tk.MustExec("explain insert into t select 1")
+	tk.MustQuery("explain insert into t select 1")
 	tk.MustQuery("select * from t").Check(testkit.Rows("2"))
-	tk.MustExec("explain analyze insert into t select 1")
-	tk.MustQuery("select * from t order by a").Check(testkit.Rows("1", "2"))
+	tk.MustQuery("explain analyze insert into t select 1")
+	tk.MustQuery("explain analyze replace into t values (3)")
+	tk.MustQuery("select * from t order by a").Check(testkit.Rows("1", "2", "3"))
 }
 
 func (s *testSuite1) TestExplainAnalyzeMemory(c *C) {
diff --git a/executor/explain_unit_test.go b/executor/explain_unit_test.go
index fa9b13bc66e48..1276575f47c28 100644
--- a/executor/explain_unit_test.go
+++ b/executor/explain_unit_test.go
@@ -81,6 +81,10 @@ func TestExplainAnalyzeInvokeNextAndClose(t *testing.T) {
 		t.Errorf(err.Error())
 	}
 	// mockErrorOperator panic
+	explainExec = &ExplainExec{
+		baseExecutor: baseExec,
+		explain:      nil,
+	}
 	mockOpr = mockErrorOperator{baseExec, true, false}
 	explainExec.analyzeExec = &mockOpr
 	defer func() {
diff --git a/executor/index_lookup_merge_join.go b/executor/index_lookup_merge_join.go
index 73396875e6659..64c6aa36ed91b 100644
--- a/executor/index_lookup_merge_join.go
+++ b/executor/index_lookup_merge_join.go
@@ -95,6 +95,7 @@ type innerMergeCtx struct {
 
 type lookUpMergeJoinTask struct {
 	outerResult   *chunk.List
+	outerMatch    [][]bool
 	outerOrderIdx []chunk.RowPtr
 
 	innerResult *chunk.Chunk
@@ -432,25 +433,23 @@ func (imw *innerMergeWorker) run(ctx context.Context, wg *sync.WaitGroup, cancel
 
 func (imw *innerMergeWorker) handleTask(ctx context.Context, task *lookUpMergeJoinTask) (err error) {
 	numOuterChks := task.outerResult.NumChunks()
-	var outerMatch [][]bool
 	if imw.outerMergeCtx.filter != nil {
-		outerMatch = make([][]bool, numOuterChks)
+		task.outerMatch = make([][]bool, numOuterChks)
 		for i := 0; i < numOuterChks; i++ {
 			chk := task.outerResult.GetChunk(i)
-			outerMatch[i] = make([]bool, chk.NumRows())
-			outerMatch[i], err = expression.VectorizedFilter(imw.ctx, imw.outerMergeCtx.filter, chunk.NewIterator4Chunk(chk), outerMatch[i])
+			task.outerMatch[i] = make([]bool, chk.NumRows())
+			task.outerMatch[i], err = expression.VectorizedFilter(imw.ctx, imw.outerMergeCtx.filter, chunk.NewIterator4Chunk(chk), task.outerMatch[i])
 			if err != nil {
 				return err
 			}
 		}
 	}
+	task.memTracker.Consume(int64(cap(task.outerMatch)))
 	task.outerOrderIdx = make([]chunk.RowPtr, 0, task.outerResult.Len())
 	for i := 0; i < numOuterChks; i++ {
 		numRow := task.outerResult.GetChunk(i).NumRows()
 		for j := 0; j < numRow; j++ {
-			if len(outerMatch) == 0 || outerMatch[i][j] {
-				task.outerOrderIdx = append(task.outerOrderIdx, chunk.RowPtr{ChkIdx: uint32(i), RowIdx: uint32(j)})
-			}
+			task.outerOrderIdx = append(task.outerOrderIdx, chunk.RowPtr{ChkIdx: uint32(i), RowIdx: uint32(j)})
 		}
 	}
 	task.memTracker.Consume(int64(cap(task.outerOrderIdx)))
@@ -653,8 +652,11 @@ func (imw *innerMergeWorker) constructDatumLookupKeys(task *lookUpMergeJoinTask)
 	return dLookUpKeys, nil
 }
 
-func (imw *innerMergeWorker) constructDatumLookupKey(task *lookUpMergeJoinTask, rowIdx chunk.RowPtr) (*indexJoinLookUpContent, error) {
-	outerRow := task.outerResult.GetRow(rowIdx)
+func (imw *innerMergeWorker) constructDatumLookupKey(task *lookUpMergeJoinTask, idx chunk.RowPtr) (*indexJoinLookUpContent, error) {
+	if task.outerMatch != nil && !task.outerMatch[idx.ChkIdx][idx.RowIdx] {
+		return nil, nil
+	}
+	outerRow := task.outerResult.GetRow(idx)
 	sc := imw.ctx.GetSessionVars().StmtCtx
 	keyLen := len(imw.keyCols)
 	dLookupKey := make([]types.Datum, 0, keyLen)
@@ -688,7 +690,7 @@ func (imw *innerMergeWorker) constructDatumLookupKey(task *lookUpMergeJoinTask,
 		}
 		dLookupKey = append(dLookupKey, innerValue)
 	}
-	return &indexJoinLookUpContent{keys: dLookupKey, row: task.outerResult.GetRow(rowIdx)}, nil
+	return &indexJoinLookUpContent{keys: dLookupKey, row: task.outerResult.GetRow(idx)}, nil
 }
 
 func (imw *innerMergeWorker) dedupDatumLookUpKeys(lookUpContents []*indexJoinLookUpContent) []*indexJoinLookUpContent {
diff --git a/executor/index_lookup_merge_join_test.go b/executor/index_lookup_merge_join_test.go
index f52b652d346a9..c0bb253cec963 100644
--- a/executor/index_lookup_merge_join_test.go
+++ b/executor/index_lookup_merge_join_test.go
@@ -134,3 +134,15 @@ func (s *testSuiteWithData) TestIndexJoinOnSinglePartitionTable(c *C) {
 		c.Assert(strings.Index(rows[0], "IndexJoin"), Equals, 0)
 	}
 }
+
+func (s *testSuite9) TestIssue20400(c *C) {
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("drop table if exists t, s")
+	tk.MustExec("create table s(a int, index(a))")
+	tk.MustExec("create table t(a int)")
+	tk.MustExec("insert into t values(1)")
+	tk.MustQuery("select /*+ hash_join(t,s)*/ * from t left join s on t.a=s.a and t.a>1").Check(
+		testkit.Rows("1 <nil>"))
+	tk.MustQuery("select /*+ inl_merge_join(t,s)*/ * from t left join s on t.a=s.a and t.a>1").Check(
+		testkit.Rows("1 <nil>"))
+}
diff --git a/executor/infoschema_reader.go b/executor/infoschema_reader.go
index 137a29b8cde60..59e5f4b3b2d5e 100644
--- a/executor/infoschema_reader.go
+++ b/executor/infoschema_reader.go
@@ -451,7 +451,7 @@ func (e *memtableRetriever) setDataFromTables(ctx sessionctx.Context, schemas []
 				}
 
 				var rowCount, dataLength, indexLength uint64
-				if table.GetPartitionInfo() == nil {
+				if table.GetPartitionInfo() == nil || ctx.GetSessionVars().UseDynamicPartitionPrune() {
 					rowCount = tableRowsMap[table.ID]
 					dataLength, indexLength = getDataAndIndexLength(table, table.ID, rowCount, colLengthMap)
 				} else {
diff --git a/executor/infoschema_reader_test.go b/executor/infoschema_reader_test.go
index e5328b2be1f06..670afa8e8b49d 100644
--- a/executor/infoschema_reader_test.go
+++ b/executor/infoschema_reader_test.go
@@ -418,37 +418,39 @@ func (s *testInfoschemaTableSerialSuite) TestPartitionsTable(c *C) {
 	is := do.InfoSchema()
 
 	tk := testkit.NewTestKit(c, s.store)
-
 	tk.MustExec("USE test;")
-	tk.MustExec("DROP TABLE IF EXISTS `test_partitions`;")
-	tk.MustExec(`CREATE TABLE test_partitions (a int, b int, c varchar(5), primary key(a), index idx(c)) PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (6), PARTITION p1 VALUES LESS THAN (11), PARTITION p2 VALUES LESS THAN (16));`)
-	err := h.HandleDDLEvent(<-h.DDLEventCh())
-	c.Assert(err, IsNil)
-	tk.MustExec(`insert into test_partitions(a, b, c) values(1, 2, "c"), (7, 3, "d"), (12, 4, "e");`)
-
-	tk.MustQuery("select PARTITION_NAME, PARTITION_DESCRIPTION from information_schema.PARTITIONS where table_name='test_partitions';").Check(
-		testkit.Rows("" +
-			"p0 6]\n" +
-			"[p1 11]\n" +
-			"[p2 16"))
-
-	tk.MustQuery("select table_rows, avg_row_length, data_length, index_length from information_schema.PARTITIONS where table_name='test_partitions';").Check(
-		testkit.Rows("" +
-			"0 0 0 0]\n" +
-			"[0 0 0 0]\n" +
-			"[0 0 0 0"))
-	c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
-	c.Assert(h.Update(is), IsNil)
-	tk.MustQuery("select table_rows, avg_row_length, data_length, index_length from information_schema.PARTITIONS where table_name='test_partitions';").Check(
-		testkit.Rows("" +
-			"1 18 18 2]\n" +
-			"[1 18 18 2]\n" +
-			"[1 18 18 2"))
+	testkit.WithPruneMode(tk, variable.StaticOnly, func() {
+		c.Assert(h.RefreshVars(), IsNil)
+		tk.MustExec("DROP TABLE IF EXISTS `test_partitions`;")
+		tk.MustExec(`CREATE TABLE test_partitions (a int, b int, c varchar(5), primary key(a), index idx(c)) PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (6), PARTITION p1 VALUES LESS THAN (11), PARTITION p2 VALUES LESS THAN (16));`)
+		err := h.HandleDDLEvent(<-h.DDLEventCh())
+		c.Assert(err, IsNil)
+		tk.MustExec(`insert into test_partitions(a, b, c) values(1, 2, "c"), (7, 3, "d"), (12, 4, "e");`)
+
+		tk.MustQuery("select PARTITION_NAME, PARTITION_DESCRIPTION from information_schema.PARTITIONS where table_name='test_partitions';").Check(
+			testkit.Rows("" +
+				"p0 6]\n" +
+				"[p1 11]\n" +
+				"[p2 16"))
+
+		tk.MustQuery("select table_rows, avg_row_length, data_length, index_length from information_schema.PARTITIONS where table_name='test_partitions';").Check(
+			testkit.Rows("" +
+				"0 0 0 0]\n" +
+				"[0 0 0 0]\n" +
+				"[0 0 0 0"))
+		c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
+		c.Assert(h.Update(is), IsNil)
+		tk.MustQuery("select table_rows, avg_row_length, data_length, index_length from information_schema.PARTITIONS where table_name='test_partitions';").Check(
+			testkit.Rows("" +
+				"1 18 18 2]\n" +
+				"[1 18 18 2]\n" +
+				"[1 18 18 2"))
+	})
 
 	// Test for table has no partitions.
 	tk.MustExec("DROP TABLE IF EXISTS `test_partitions_1`;")
 	tk.MustExec(`CREATE TABLE test_partitions_1 (a int, b int, c varchar(5), primary key(a), index idx(c));`)
-	err = h.HandleDDLEvent(<-h.DDLEventCh())
+	err := h.HandleDDLEvent(<-h.DDLEventCh())
 	c.Assert(err, IsNil)
 	tk.MustExec(`insert into test_partitions_1(a, b, c) values(1, 2, "c"), (7, 3, "d"), (12, 4, "e");`)
 	c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
diff --git a/executor/inspection_profile.go b/executor/inspection_profile.go
index 56bf9153fa10f..397c276634f88 100644
--- a/executor/inspection_profile.go
+++ b/executor/inspection_profile.go
@@ -323,11 +323,16 @@ func NewProfileBuilder(sctx sessionctx.Context, start, end time.Time, tp string)
 
 // Collect uses to collect the related metric information.
 func (pb *profileBuilder) Collect() error {
-	pb.buf.WriteString(fmt.Sprintf(`digraph "%s" {`, "tidb_profile"))
-	pb.buf.WriteByte('\n')
-	pb.buf.WriteString(`node [style=filled fillcolor="#f8f8f8"]`)
-	pb.buf.WriteByte('\n')
-	err := pb.addMetricTree(pb.genTiDBQueryTree(), "tidb_query")
+	tidbQuery := pb.genTiDBQueryTree()
+	err := pb.init(tidbQuery, "tidb_query")
+	if err != nil {
+		return err
+	}
+	err = pb.traversal(tidbQuery)
+	if err != nil {
+		return err
+	}
+	err = pb.traversal(pb.genTiDBGCTree())
 	if err != nil {
 		return err
 	}
@@ -350,8 +355,8 @@ func (pb *profileBuilder) getNameID(name string) uint64 {
 	return id
 }
 
-func (pb *profileBuilder) addMetricTree(root *metricNode, name string) error {
-	if root == nil {
+func (pb *profileBuilder) init(total *metricNode, name string) error {
+	if total == nil {
 		return nil
 	}
 	tp := "total_time"
@@ -361,9 +366,13 @@ func (pb *profileBuilder) addMetricTree(root *metricNode, name string) error {
 	case metricValueCnt:
 		tp = "total_count"
 	}
+	pb.buf.WriteString(fmt.Sprintf(`digraph "%s" {`, "tidb_profile"))
+	pb.buf.WriteByte('\n')
+	pb.buf.WriteString(`node [style=filled fillcolor="#f8f8f8"]`)
+	pb.buf.WriteByte('\n')
 	pb.buf.WriteString(fmt.Sprintf(`subgraph %[1]s { "%[1]s" [shape=box fontsize=16 label="Type: %[1]s\lTime: %s\lDuration: %s\l"] }`, name+"_"+tp, pb.start.String(), pb.end.Sub(pb.start).String()))
 	pb.buf.WriteByte('\n')
-	v, err := pb.GetTotalValue(root)
+	v, err := pb.GetTotalValue(total)
 	if err != nil {
 		return err
 	}
@@ -372,7 +381,7 @@ func (pb *profileBuilder) addMetricTree(root *metricNode, name string) error {
 	} else {
 		pb.totalValue = 1
 	}
-	return pb.traversal(root)
+	return nil
 }
 
 func (pb *profileBuilder) GetTotalValue(root *metricNode) (float64, error) {
@@ -622,6 +631,21 @@ func (pb *profileBuilder) dotColor(score float64, isBackground bool) string {
 	return fmt.Sprintf("#%02x%02x%02x", uint8(r*255.0), uint8(g*255.0), uint8(b*255.0))
 }
 
+func (pb *profileBuilder) genTiDBGCTree() *metricNode {
+	tidbGC := &metricNode{
+		table:          "tidb_gc",
+		isPartOfParent: true,
+		label:          []string{"stage"},
+		children: []*metricNode{
+			{
+				table:          "tidb_kv_request",
+				isPartOfParent: true,
+			},
+		},
+	}
+	return tidbGC
+}
+
 func (pb *profileBuilder) genTiDBQueryTree() *metricNode {
 	tidbKVRequest := &metricNode{
 		table:          "tidb_kv_request",
@@ -689,6 +713,10 @@ func (pb *profileBuilder) genTiDBQueryTree() *metricNode {
 							},
 						},
 					},
+					{
+						table: "tikv_gc_tasks",
+						label: []string{"task"},
+					},
 				},
 			},
 		},
@@ -713,6 +741,9 @@ func (pb *profileBuilder) genTiDBQueryTree() *metricNode {
 					{
 						table: "tidb_owner_handle_syncer",
 					},
+					{
+						table: "tidb_meta_operation",
+					},
 				},
 			},
 		},
diff --git a/executor/inspection_result.go b/executor/inspection_result.go
index b14284b3889c8..4d8bd69ca3edb 100644
--- a/executor/inspection_result.go
+++ b/executor/inspection_result.go
@@ -142,7 +142,7 @@ func (e *inspectionResultRetriever) retrieve(ctx context.Context, sctx sessionct
 		e.instanceToStatusAddress = make(map[string]string)
 		e.statusToInstanceAddress = make(map[string]string)
 		sql := "select instance,status_address from information_schema.cluster_info;"
-		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(sql)
+		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQLWithContext(ctx, sql)
 		if err != nil {
 			sctx.GetSessionVars().StmtCtx.AppendWarning(fmt.Errorf("get cluster info failed: %v", err))
 		}
@@ -213,7 +213,7 @@ func (c configInspection) inspect(ctx context.Context, sctx sessionctx.Context,
 	return results
 }
 
-func (configInspection) inspectDiffConfig(_ context.Context, sctx sessionctx.Context, filter inspectionFilter) []inspectionResult {
+func (configInspection) inspectDiffConfig(ctx context.Context, sctx sessionctx.Context, filter inspectionFilter) []inspectionResult {
 	// check the configuration consistent
 	ignoreConfigKey := []string{
 		// TiDB
@@ -249,14 +249,14 @@ func (configInspection) inspectDiffConfig(_ context.Context, sctx sessionctx.Con
 	}
 	sql := fmt.Sprintf("select type, `key`, count(distinct value) as c from information_schema.cluster_config where `key` not in ('%s') group by type, `key` having c > 1",
 		strings.Join(ignoreConfigKey, "','"))
-	rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(sql)
+	rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQLWithContext(ctx, sql)
 	if err != nil {
 		sctx.GetSessionVars().StmtCtx.AppendWarning(fmt.Errorf("check configuration consistency failed: %v", err))
 	}
 
 	generateDetail := func(tp, item string) string {
 		query := fmt.Sprintf("select value, instance from information_schema.cluster_config where type='%s' and `key`='%s';", tp, item)
-		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(query)
+		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQLWithContext(ctx, query)
 		if err != nil {
 			sctx.GetSessionVars().StmtCtx.AppendWarning(fmt.Errorf("check configuration consistency failed: %v", err))
 			return fmt.Sprintf("the cluster has different config value of %[2]s, execute the sql to see more detail: select * from information_schema.cluster_config where type='%[1]s' and `key`='%[2]s'",
@@ -324,7 +324,7 @@ func (c configInspection) inspectCheckConfig(ctx context.Context, sctx sessionct
 		}
 		sql := fmt.Sprintf("select instance from information_schema.cluster_config where type = '%s' and `key` = '%s' and value = '%s'",
 			cas.tp, cas.key, cas.value)
-		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(sql)
+		rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQLWithContext(ctx, sql)
 		if err != nil {
 			sctx.GetSessionVars().StmtCtx.AppendWarning(fmt.Errorf("check configuration in reason failed: %v", err))
 		}
@@ -437,10 +437,10 @@ func (configInspection) convertReadableSizeToByteSize(sizeStr string) (uint64, e
 	return uint64(size) * rate, nil
 }
 
-func (versionInspection) inspect(_ context.Context, sctx sessionctx.Context, filter inspectionFilter) []inspectionResult {
+func (versionInspection) inspect(ctx context.Context, sctx sessionctx.Context, filter inspectionFilter) []inspectionResult {
 	// check the configuration consistent
 	sql := "select type, count(distinct git_hash) as c from information_schema.cluster_info group by type having c > 1;"
-	rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(sql)
+	rows, _, err := sctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQLWithContext(ctx, sql)
 	if err != nil {
 		sctx.GetSessionVars().StmtCtx.AppendWarning(fmt.Errorf("check version consistency failed: %v", err))
 	}
diff --git a/executor/memtable_reader.go b/executor/memtable_reader.go
index 1f5a88e516982..bf17e3520dbb6 100644
--- a/executor/memtable_reader.go
+++ b/executor/memtable_reader.go
@@ -40,6 +40,7 @@ import (
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util"
 	"github.com/pingcap/tidb/util/chunk"
+	"github.com/pingcap/tidb/util/execdetails"
 	"github.com/pingcap/tidb/util/pdapi"
 	"github.com/pingcap/tidb/util/set"
 	"go.uber.org/zap"
@@ -53,9 +54,12 @@ type dummyCloser struct{}
 
 func (dummyCloser) close() error { return nil }
 
+func (dummyCloser) getRuntimeStats() execdetails.RuntimeStats { return nil }
+
 type memTableRetriever interface {
 	retrieve(ctx context.Context, sctx sessionctx.Context) ([][]types.Datum, error)
 	close() error
+	getRuntimeStats() execdetails.RuntimeStats
 }
 
 // MemTableReaderExec executes memTable information retrieving from the MemTable components
@@ -127,6 +131,9 @@ func (e *MemTableReaderExec) Next(ctx context.Context, req *chunk.Chunk) error {
 
 // Close implements the Executor Close interface.
 func (e *MemTableReaderExec) Close() error {
+	if stats := e.retriever.getRuntimeStats(); stats != nil && e.runtimeStats != nil {
+		e.ctx.GetSessionVars().StmtCtx.RuntimeStatsColl.RegisterStats(e.id, stats)
+	}
 	return e.retriever.close()
 }
 
@@ -661,3 +668,7 @@ func (e *clusterLogRetriever) close() error {
 	}
 	return nil
 }
+
+func (e *clusterLogRetriever) getRuntimeStats() execdetails.RuntimeStats {
+	return nil
+}
diff --git a/executor/show.go b/executor/show.go
index 521532988b71e..d06a135418970 100644
--- a/executor/show.go
+++ b/executor/show.go
@@ -474,6 +474,9 @@ func (e *ShowExec) fetchShowColumns(ctx context.Context) error {
 			if idx >= 0 {
 				col.FieldType = *viewSchema.Columns[idx].GetType()
 			}
+			if col.Tp == mysql.TypeVarString {
+				col.Tp = mysql.TypeVarchar
+			}
 		}
 	}
 	for _, col := range cols {
diff --git a/executor/show_stats.go b/executor/show_stats.go
index 79b1c97a7dfb7..ac6a1542e98ab 100644
--- a/executor/show_stats.go
+++ b/executor/show_stats.go
@@ -31,7 +31,7 @@ func (e *ShowExec) fetchShowStatsMeta() error {
 	for _, db := range dbs {
 		for _, tbl := range db.Tables {
 			pi := tbl.GetPartitionInfo()
-			if pi == nil {
+			if pi == nil || e.ctx.GetSessionVars().UseDynamicPartitionPrune() {
 				e.appendTableForStatsMeta(db.Name.O, tbl.Name.O, "", h.GetTableStats(tbl))
 			} else {
 				for _, def := range pi.Definitions {
@@ -64,7 +64,7 @@ func (e *ShowExec) fetchShowStatsHistogram() error {
 	for _, db := range dbs {
 		for _, tbl := range db.Tables {
 			pi := tbl.GetPartitionInfo()
-			if pi == nil {
+			if pi == nil || e.ctx.GetSessionVars().UseDynamicPartitionPrune() {
 				e.appendTableForStatsHistograms(db.Name.O, tbl.Name.O, "", h.GetTableStats(tbl))
 			} else {
 				for _, def := range pi.Definitions {
@@ -119,7 +119,7 @@ func (e *ShowExec) fetchShowStatsBuckets() error {
 	for _, db := range dbs {
 		for _, tbl := range db.Tables {
 			pi := tbl.GetPartitionInfo()
-			if pi == nil {
+			if pi == nil || e.ctx.GetSessionVars().UseDynamicPartitionPrune() {
 				if err := e.appendTableForStatsBuckets(db.Name.O, tbl.Name.O, "", h.GetTableStats(tbl)); err != nil {
 					return err
 				}
@@ -199,7 +199,7 @@ func (e *ShowExec) fetchShowStatsHealthy() {
 	for _, db := range dbs {
 		for _, tbl := range db.Tables {
 			pi := tbl.GetPartitionInfo()
-			if pi == nil {
+			if pi == nil || e.ctx.GetSessionVars().UseDynamicPartitionPrune() {
 				e.appendTableForStatsHealthy(db.Name.O, tbl.Name.O, "", h.GetTableStats(tbl))
 			} else {
 				for _, def := range pi.Definitions {
diff --git a/executor/slow_query.go b/executor/slow_query.go
old mode 100644
new mode 100755
index fab505f431910..ca573c6370510
--- a/executor/slow_query.go
+++ b/executor/slow_query.go
@@ -18,12 +18,14 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/pingcap/errors"
@@ -41,6 +43,7 @@ import (
 	"github.com/pingcap/tidb/util/execdetails"
 	"github.com/pingcap/tidb/util/hack"
 	"github.com/pingcap/tidb/util/logutil"
+	"github.com/pingcap/tidb/util/memory"
 	"github.com/pingcap/tidb/util/plancodec"
 	"go.uber.org/zap"
 )
@@ -57,6 +60,7 @@ type slowQueryRetriever struct {
 	checker     *slowLogChecker
 
 	parsedSlowLogCh chan parsedSlowLog
+	stats           *slowQueryRuntimeStats
 }
 
 func (e *slowQueryRetriever) retrieve(ctx context.Context, sctx sessionctx.Context) ([][]types.Datum, error) {
@@ -98,6 +102,7 @@ func (e *slowQueryRetriever) initialize(sctx sessionctx.Context) error {
 		hasProcessPriv: hasProcessPriv,
 		user:           sctx.GetSessionVars().User,
 	}
+	e.stats = &slowQueryRuntimeStats{}
 	if e.extractor != nil {
 		e.checker.enableTimeCheck = e.extractor.Enable
 		e.checker.startTime = types.NewTime(types.FromGoTime(e.extractor.StartTime), mysql.TypeDatetime, types.MaxFsp)
@@ -123,14 +128,31 @@ type parsedSlowLog struct {
 	err  error
 }
 
+func (e *slowQueryRetriever) getNextFile() *os.File {
+	if e.fileIdx >= len(e.files) {
+		return nil
+	}
+	file := e.files[e.fileIdx].file
+	e.fileIdx++
+	if e.stats != nil {
+		stat, err := file.Stat()
+		if err == nil {
+			// ignore the err will be ok.
+			e.stats.readFileSize += stat.Size()
+			e.stats.readFileNum++
+		}
+	}
+	return file
+}
+
 func (e *slowQueryRetriever) parseDataForSlowLog(ctx context.Context, sctx sessionctx.Context) {
-	if len(e.files) == 0 {
-		close(e.parsedSlowLogCh)
+	defer close(e.parsedSlowLogCh)
+	file := e.getNextFile()
+	if file == nil {
 		return
 	}
-	reader := bufio.NewReader(e.files[0].file)
+	reader := bufio.NewReader(file)
 	e.parseSlowLog(ctx, sctx, reader, 64)
-	close(e.parsedSlowLogCh)
 }
 
 func (e *slowQueryRetriever) dataForSlowLog(ctx context.Context) ([][]types.Datum, bool, error) {
@@ -228,13 +250,13 @@ func (e *slowQueryRetriever) getBatchLog(reader *bufio.Reader, offset *offset, n
 			lineByte, err := getOneLine(reader)
 			if err != nil {
 				if err == io.EOF {
-					e.fileIdx++
 					e.fileLine = 0
-					if e.fileIdx >= len(e.files) {
+					file := e.getNextFile()
+					if file == nil {
 						return log, nil
 					}
 					offset.length = len(log)
-					reader.Reset(e.files[e.fileIdx].file)
+					reader.Reset(file)
 					continue
 				}
 				return log, err
@@ -256,14 +278,22 @@ func (e *slowQueryRetriever) parseSlowLog(ctx context.Context, sctx sessionctx.C
 	var wg sync.WaitGroup
 	offset := offset{offset: 0, length: 0}
 	// To limit the num of go routine
-	ch := make(chan int, sctx.GetSessionVars().Concurrency.DistSQLScanConcurrency())
+	concurrent := sctx.GetSessionVars().Concurrency.DistSQLScanConcurrency()
+	ch := make(chan int, concurrent)
+	if e.stats != nil {
+		e.stats.concurrent = concurrent
+	}
 	defer close(ch)
 	for {
+		startTime := time.Now()
 		log, err := e.getBatchLog(reader, &offset, logNum)
-		if err != nil {
+		if err != nil || len(log) == 0 {
 			e.parsedSlowLogCh <- parsedSlowLog{nil, err}
 			break
 		}
+		if e.stats != nil {
+			e.stats.readFile += time.Since(startTime)
+		}
 		start := offset
 		wg.Add(1)
 		ch <- 1
@@ -303,10 +333,14 @@ func getLineIndex(offset offset, index int) int {
 }
 
 func (e *slowQueryRetriever) parseLog(ctx sessionctx.Context, log []string, offset offset) (data [][]types.Datum, err error) {
+	start := time.Now()
 	defer func() {
 		if r := recover(); r != nil {
 			err = fmt.Errorf("%s", r)
 		}
+		if e.stats != nil {
+			atomic.AddInt64(&e.stats.parseLog, int64(time.Since(start)))
+		}
 	}()
 	failpoint.Inject("errorMockParseSlowLogPanic", func(val failpoint.Value) {
 		if val.(bool) {
@@ -704,7 +738,16 @@ type logFile struct {
 
 // getAllFiles is used to get all slow-log needed to parse, it is exported for test.
 func (e *slowQueryRetriever) getAllFiles(sctx sessionctx.Context, logFilePath string) ([]logFile, error) {
+	totalFileNum := 0
+	if e.stats != nil {
+		startTime := time.Now()
+		defer func() {
+			e.stats.initialize = time.Since(startTime)
+			e.stats.totalFileNum = totalFileNum
+		}()
+	}
 	if e.extractor == nil || !e.extractor.Enable {
+		totalFileNum = 1
 		file, err := os.Open(logFilePath)
 		if err != nil {
 			if os.IsNotExist(err) {
@@ -725,10 +768,11 @@ func (e *slowQueryRetriever) getAllFiles(sctx sessionctx.Context, logFilePath st
 		}
 		return nil
 	}
-	err := filepath.Walk(logDir, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return handleErr(err)
-		}
+	files, err := ioutil.ReadDir(logDir)
+	if err != nil {
+		return nil, err
+	}
+	walkFn := func(path string, info os.FileInfo) error {
 		if info.IsDir() {
 			return nil
 		}
@@ -736,6 +780,7 @@ func (e *slowQueryRetriever) getAllFiles(sctx sessionctx.Context, logFilePath st
 		if !strings.HasPrefix(path, prefix) {
 			return nil
 		}
+		totalFileNum++
 		file, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
 		if err != nil {
 			return handleErr(err)
@@ -776,7 +821,13 @@ func (e *slowQueryRetriever) getAllFiles(sctx sessionctx.Context, logFilePath st
 		})
 		skip = true
 		return nil
-	})
+	}
+	for _, file := range files {
+		err := walkFn(filepath.Join(logDir, file.Name()), file)
+		if err != nil {
+			return nil, err
+		}
+	}
 	// Sort by start time
 	sort.Slice(logFiles, func(i, j int) bool {
 		return logFiles[i].start.Before(logFiles[j].start)
@@ -808,55 +859,133 @@ func (e *slowQueryRetriever) getFileStartTime(file *os.File) (time.Time, error)
 	}
 	return t, errors.Errorf("malform slow query file %v", file.Name())
 }
+
+func (e *slowQueryRetriever) getRuntimeStats() execdetails.RuntimeStats {
+	return e.stats
+}
+
+type slowQueryRuntimeStats struct {
+	totalFileNum int
+	readFileNum  int
+	readFile     time.Duration
+	initialize   time.Duration
+	readFileSize int64
+	parseLog     int64
+	concurrent   int
+}
+
+// String implements the RuntimeStats interface.
+func (s *slowQueryRuntimeStats) String() string {
+	return fmt.Sprintf("initialize: %s, read_file: %s, parse_log: {time:%s, concurrency:%v}, total_file: %v, read_file: %v, read_size: %s",
+		s.initialize, s.readFile, time.Duration(s.parseLog), s.concurrent,
+		s.totalFileNum, s.readFileNum, memory.BytesToString(s.readFileSize))
+}
+
+// Merge implements the RuntimeStats interface.
+func (s *slowQueryRuntimeStats) Merge(rs execdetails.RuntimeStats) {
+	tmp, ok := rs.(*slowQueryRuntimeStats)
+	if !ok {
+		return
+	}
+	s.totalFileNum += tmp.totalFileNum
+	s.readFileNum += tmp.readFileNum
+	s.readFile += tmp.readFile
+	s.initialize += tmp.initialize
+	s.readFileSize += tmp.readFileSize
+	s.parseLog += tmp.parseLog
+}
+
+// Clone implements the RuntimeStats interface.
+func (s *slowQueryRuntimeStats) Clone() execdetails.RuntimeStats {
+	newRs := *s
+	return &newRs
+}
+
+// Tp implements the RuntimeStats interface.
+func (s *slowQueryRuntimeStats) Tp() int {
+	return execdetails.TpSlowQueryRuntimeStat
+}
+
 func (e *slowQueryRetriever) getFileEndTime(file *os.File) (time.Time, error) {
 	var t time.Time
+	var tried int
 	stat, err := file.Stat()
 	if err != nil {
 		return t, err
 	}
-	fileSize := stat.Size()
-	cursor := int64(0)
-	line := make([]byte, 0, 64)
+	endCursor := stat.Size()
 	maxLineNum := 128
-	tryGetTime := func(line []byte) string {
-		for i, j := 0, len(line)-1; i < j; i, j = i+1, j-1 {
-			line[i], line[j] = line[j], line[i]
+	for {
+		lines, readBytes, err := readLastLines(file, endCursor)
+		if err != nil {
+			return t, err
+		}
+		// read out the file
+		if readBytes == 0 {
+			break
+		}
+		endCursor -= int64(readBytes)
+		for i := len(lines) - 1; i >= 0; i-- {
+			if strings.HasPrefix(lines[i], variable.SlowLogStartPrefixStr) {
+				return ParseTime(lines[i][len(variable.SlowLogStartPrefixStr):])
+			}
 		}
-		lineStr := string(line)
-		lineStr = strings.TrimSpace(lineStr)
-		if strings.HasPrefix(lineStr, variable.SlowLogStartPrefixStr) {
-			return lineStr[len(variable.SlowLogStartPrefixStr):]
+		tried += len(lines)
+		if tried >= maxLineNum {
+			break
 		}
-		return ""
 	}
+	return t, errors.Errorf("invalid slow query file %v", file.Name())
+}
+
+// Read lines from the end of a file
+// endCursor initial value should be the filesize
+func readLastLines(file *os.File, endCursor int64) ([]string, int, error) {
+	var lines []byte
+	var firstNonNewlinePos int
+	var cursor = endCursor
 	for {
-		cursor -= 1
-		_, err := file.Seek(cursor, io.SeekEnd)
-		if err != nil {
-			return t, err
+		// stop if we are at the beginning
+		// check it in the start to avoid read beyond the size
+		if cursor <= 0 {
+			break
+		}
+
+		var size int64 = 4096
+		if cursor < size {
+			size = cursor
 		}
+		cursor -= size
 
-		char := make([]byte, 1)
-		_, err = file.Read(char)
+		_, err := file.Seek(cursor, io.SeekStart)
 		if err != nil {
-			return t, err
+			return nil, 0, err
 		}
-		// If find a line.
-		if cursor != -1 && (char[0] == '\n' || char[0] == '\r') {
-			if timeStr := tryGetTime(line); len(timeStr) > 0 {
-				return ParseTime(timeStr)
-			}
-			line = line[:0]
-			maxLineNum -= 1
+		chars := make([]byte, size)
+		_, err = file.Read(chars)
+		if err != nil {
+			return nil, 0, err
 		}
-		line = append(line, char[0])
-		if cursor == -fileSize || maxLineNum <= 0 {
-			if timeStr := tryGetTime(line); len(timeStr) > 0 {
-				return ParseTime(timeStr)
+		lines = append(chars, lines...)
+
+		// find first '\n' or '\r'
+		for i := 0; i < len(chars); i++ {
+			// reach the line end
+			// the first newline may be in the line end at the first round
+			if i >= len(lines)-1 {
+				break
 			}
-			return t, errors.Errorf("malform slow query file %v", file.Name())
+			if (chars[i] == 10 || chars[i] == 13) && chars[i+1] != 10 && chars[i+1] != 13 {
+				firstNonNewlinePos = i + 1
+				break
+			}
+		}
+		if firstNonNewlinePos > 0 {
+			break
 		}
 	}
+	finalStr := string(lines[firstNonNewlinePos:])
+	return strings.Split(strings.ReplaceAll(finalStr, "\r\n", "\n"), "\n"), len(finalStr), nil
 }
 
 func (e *slowQueryRetriever) initializeAsyncParsing(ctx context.Context, sctx sessionctx.Context) {
diff --git a/executor/split.go b/executor/split.go
old mode 100755
new mode 100644
diff --git a/expression/builtin_compare.go b/expression/builtin_compare.go
index df857488d0cf4..8f590a6fc5ad7 100644
--- a/expression/builtin_compare.go
+++ b/expression/builtin_compare.go
@@ -1305,7 +1305,7 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 			//		   -inf:  10000000 & 1 == 0
 			// For uint:
 			//			inf:  11111111 & 1 == 1
-			//		   -inf:  00000000 & 0 == 0
+			//		   -inf:  00000000 & 1 == 0
 			if arg1.Value.GetInt64()&1 == 1 {
 				isPositiveInfinite = true
 			} else {
@@ -1344,7 +1344,55 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 		return []Expression{NewOne(), NewZero()}
 	}
 
-	return []Expression{finalArg0, finalArg1}
+	return c.refineArgsByUnsignedFlag(ctx, []Expression{finalArg0, finalArg1})
+}
+
+func (c *compareFunctionClass) refineArgsByUnsignedFlag(ctx sessionctx.Context, args []Expression) []Expression {
+	// Only handle int cases, cause MySQL declares that `UNSIGNED` is deprecated for FLOAT, DOUBLE and DECIMAL types,
+	// and support for it would be removed in a future version.
+	if args[0].GetType().EvalType() != types.ETInt || args[1].GetType().EvalType() != types.ETInt {
+		return args
+	}
+	colArgs := make([]*Column, 2)
+	constArgs := make([]*Constant, 2)
+	for i, arg := range args {
+		switch x := arg.(type) {
+		case *Constant:
+			constArgs[i] = x
+		case *Column:
+			colArgs[i] = x
+		case *CorrelatedColumn:
+			colArgs[i] = &x.Column
+		}
+	}
+	for i := 0; i < 2; i++ {
+		if con, col := constArgs[1-i], colArgs[i]; con != nil && col != nil {
+			v, isNull, err := con.EvalInt(ctx, chunk.Row{})
+			if err != nil || isNull || v > 0 {
+				return args
+			}
+			if mysql.HasUnsignedFlag(col.RetType.Flag) && mysql.HasNotNullFlag(col.RetType.Flag) && !mysql.HasUnsignedFlag(con.RetType.Flag) {
+				op := c.op
+				if i == 1 {
+					op = symmetricOp[c.op]
+				}
+				if v == 0 && (op == opcode.LE || op == opcode.GT || op == opcode.NullEQ || op == opcode.EQ || op == opcode.NE) {
+					return args
+				}
+				// `unsigned_col < 0` equals to `1 < 0`,
+				// `unsigned_col > -1` equals to `1 > 0`,
+				// `unsigned_col <= -1` equals to `1 <= 0`,
+				// `unsigned_col >= 0` equals to `1 >= 0`,
+				// `unsigned_col == -1` equals to `1 == 0`,
+				// `unsigned_col != -1` equals to `1 != 0`,
+				// `unsigned_col <=> -1` equals to `1 <=> 0`,
+				// so we can replace the column argument with `1`, and the other constant argument with `0`.
+				args[i], args[1-i] = NewOne(), NewZero()
+				return args
+			}
+		}
+	}
+	return args
 }
 
 // getFunction sets compare built-in function signatures for various types.
diff --git a/expression/builtin_miscellaneous.go b/expression/builtin_miscellaneous.go
index 9e40a70f11e3e..cd9a7a2ca3bf0 100644
--- a/expression/builtin_miscellaneous.go
+++ b/expression/builtin_miscellaneous.go
@@ -222,8 +222,9 @@ func (c *anyValueFunctionClass) getFunction(ctx sessionctx.Context, args []Expre
 	if err != nil {
 		return nil, err
 	}
-	args[0].GetType().Flag |= bf.tp.Flag
-	*bf.tp = *args[0].GetType()
+	ft := args[0].GetType().Clone()
+	ft.Flag |= bf.tp.Flag
+	*bf.tp = *ft
 	var sig builtinFunc
 	switch argTp {
 	case types.ETDecimal:
diff --git a/expression/collation.go b/expression/collation.go
index e99ace858b89f..d8bae9f8c45c3 100644
--- a/expression/collation.go
+++ b/expression/collation.go
@@ -153,7 +153,7 @@ func deriveCoercibilityForScarlarFunc(sf *ScalarFunction) Coercibility {
 	if _, ok := sysConstFuncs[sf.FuncName.L]; ok {
 		return CoercibilitySysconst
 	}
-	if !types.IsString(sf.RetType.Tp) {
+	if sf.RetType.EvalType() != types.ETString {
 		return CoercibilityNumeric
 	}
 
@@ -170,14 +170,14 @@ func deriveCoercibilityForScarlarFunc(sf *ScalarFunction) Coercibility {
 func deriveCoercibilityForConstant(c *Constant) Coercibility {
 	if c.Value.IsNull() {
 		return CoercibilityIgnorable
-	} else if !types.IsString(c.RetType.Tp) {
+	} else if c.RetType.EvalType() != types.ETString {
 		return CoercibilityNumeric
 	}
 	return CoercibilityCoercible
 }
 
 func deriveCoercibilityForColumn(c *Column) Coercibility {
-	if !types.IsString(c.RetType.Tp) {
+	if c.RetType.EvalType() != types.ETString {
 		return CoercibilityNumeric
 	}
 	return CoercibilityImplicit
diff --git a/expression/constant_fold.go b/expression/constant_fold.go
index 8045838d594ef..1b4dcaf00c3ad 100644
--- a/expression/constant_fold.go
+++ b/expression/constant_fold.go
@@ -15,6 +15,7 @@ package expression
 
 import (
 	"github.com/pingcap/parser/ast"
+	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/logutil"
 	"go.uber.org/zap"
@@ -28,6 +29,7 @@ func init() {
 		ast.If:     ifFoldHandler,
 		ast.Ifnull: ifNullFoldHandler,
 		ast.Case:   caseWhenHandler,
+		ast.IsNull: isNullHandler,
 	}
 }
 
@@ -39,6 +41,29 @@ func FoldConstant(expr Expression) Expression {
 	return e
 }
 
+func isNullHandler(expr *ScalarFunction) (Expression, bool) {
+	arg0 := expr.GetArgs()[0]
+	if constArg, isConst := arg0.(*Constant); isConst {
+		isDeferredConst := constArg.DeferredExpr != nil || constArg.ParamMarker != nil
+		value, err := expr.Eval(chunk.Row{})
+		if err != nil {
+			// Failed to fold this expr to a constant, print the DEBUG log and
+			// return the original expression to let the error to be evaluated
+			// again, in that time, the error is returned to the client.
+			logutil.BgLogger().Debug("fold expression to constant", zap.String("expression", expr.ExplainInfo()), zap.Error(err))
+			return expr, isDeferredConst
+		}
+		if isDeferredConst {
+			return &Constant{Value: value, RetType: expr.RetType, DeferredExpr: expr}, true
+		}
+		return &Constant{Value: value, RetType: expr.RetType}, false
+	}
+	if mysql.HasNotNullFlag(arg0.GetType().Flag) {
+		return NewZero(), false
+	}
+	return expr, false
+}
+
 func ifFoldHandler(expr *ScalarFunction) (Expression, bool) {
 	args := expr.GetArgs()
 	foldedArg0, _ := foldConstant(args[0])
diff --git a/expression/flag_simplify_test.go b/expression/flag_simplify_test.go
new file mode 100644
index 0000000000000..cb0ef080e00d6
--- /dev/null
+++ b/expression/flag_simplify_test.go
@@ -0,0 +1,81 @@
+// Copyright 2020 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expression_test
+
+import (
+	"fmt"
+
+	. "github.com/pingcap/check"
+	"github.com/pingcap/tidb/domain"
+	"github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/sessionctx"
+	"github.com/pingcap/tidb/util/mock"
+	"github.com/pingcap/tidb/util/testkit"
+	"github.com/pingcap/tidb/util/testutil"
+)
+
+var _ = Suite(&testFlagSimplifySuite{})
+
+type testFlagSimplifySuite struct {
+	store    kv.Storage
+	dom      *domain.Domain
+	ctx      sessionctx.Context
+	testData testutil.TestData
+}
+
+func (s *testFlagSimplifySuite) cleanEnv(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	r := tk.MustQuery("show tables")
+	for _, tb := range r.Rows() {
+		tableName := tb[0]
+		tk.MustExec(fmt.Sprintf("drop table %v", tableName))
+	}
+}
+
+func (s *testFlagSimplifySuite) SetUpSuite(c *C) {
+	var err error
+	s.store, s.dom, err = newStoreWithBootstrap()
+	c.Assert(err, IsNil)
+	s.ctx = mock.NewContext()
+	s.testData, err = testutil.LoadTestSuiteData("testdata", "flag_simplify")
+	c.Assert(err, IsNil)
+}
+
+func (s *testFlagSimplifySuite) TearDownSuite(c *C) {
+	c.Assert(s.testData.GenerateOutputIfNeeded(), IsNil)
+	s.dom.Close()
+	s.store.Close()
+}
+
+func (s *testFlagSimplifySuite) TestSimplifyExpressionByFlag(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(id int primary key, a bigint unsigned not null, b bigint unsigned)")
+
+	var input []string
+	var output []struct {
+		SQL  string
+		Plan []string
+	}
+	s.testData.GetTestCases(c, &input, &output)
+	for i, tt := range input {
+		s.testData.OnRecord(func() {
+			output[i].SQL = tt
+			output[i].Plan = s.testData.ConvertRowsToStrings(tk.MustQuery(tt).Rows())
+		})
+		tk.MustQuery(tt).Check(testkit.Rows(output[i].Plan...))
+	}
+}
diff --git a/expression/integration_test.go b/expression/integration_test.go
old mode 100755
new mode 100644
index bb97eb95a1f46..5ccf9fc3fd633
--- a/expression/integration_test.go
+++ b/expression/integration_test.go
@@ -297,6 +297,15 @@ func (s *testIntegrationSuite) TestConvertToBit(c *C) {
 	tk.MustExec(`insert t1 value ('09-01-01')`)
 	tk.MustExec(`insert t select a from t1`)
 	tk.MustQuery("select a+0 from t").Check(testkit.Rows("20090101000000"))
+
+	// For issue 20118
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("create table t(a tinyint, b bit(63));")
+	tk.MustExec("insert ignore  into t values(599999999, -1);")
+	tk.MustQuery("show warnings;").Check(testkit.Rows(
+		"Warning 1690 constant 599999999 overflows tinyint",
+		"Warning 1406 Data Too Long, field len 63"))
+	tk.MustQuery("select * from t;").Check(testkit.Rows("127 \u007f\xff\xff\xff\xff\xff\xff\xff"))
 }
 
 func (s *testIntegrationSuite2) TestMathBuiltin(c *C) {
@@ -6704,6 +6713,48 @@ func (s *testIntegrationSerialSuite) TestNewCollationWithClusterIndex(c *C) {
 	tk.MustQuery("select d from t use index(idx) where name=\"aa\"").Check(testkit.Rows("2.11"))
 }
 
+func (s *testIntegrationSerialSuite) TestNewCollationBinaryFlag(c *C) {
+	collate.SetNewCollationEnabledForTest(true)
+	defer collate.SetNewCollationEnabledForTest(false)
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t (a varchar(2) binary, index (a));")
+	tk.MustExec("insert into t values ('a ');")
+	tk.MustQuery("select hex(a) from t;").Check(testkit.Rows("6120"))
+	tk.MustQuery("select hex(a) from t use index (a);").Check(testkit.Rows("6120"))
+
+	showCreateTable := func(createSQL string) string {
+		tk.MustExec("drop table if exists t;")
+		tk.MustExec(createSQL)
+		s := tk.MustQuery("show create table t;").Rows()[0][1].(string)
+		return s
+	}
+	var sct string
+	// define case = tuple(table_charset, table_collation, column_charset, column_collation)
+	// case: (nil, nil, nil, nil)
+	sct = showCreateTable("create table t(a varchar(10) binary);")
+	c.Assert(strings.Contains(sct, "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"), IsTrue, Commentf(sct))
+	// case: (nil, utf8_general_ci, nil, nil)
+	sct = showCreateTable("create table t(a varchar(10) binary) collate utf8_general_ci;")
+	c.Assert(strings.Contains(sct, "varchar(10) COLLATE utf8_bin"), IsTrue, Commentf(sct))
+	c.Assert(strings.Contains(sct, "ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci"), IsTrue, Commentf(sct))
+	// case: (nil, nil, nil, utf8_general_ci)
+	sct = showCreateTable("create table t(a varchar(10) binary collate utf8_general_ci);")
+	c.Assert(strings.Contains(sct, "varchar(10) CHARACTER SET utf8 COLLATE utf8_bin"), IsTrue, Commentf(sct))
+	// case: (nil, nil, utf8, utf8_general_ci)
+	sct = showCreateTable("create table t(a varchar(10) binary charset utf8 collate utf8_general_ci);")
+	c.Assert(strings.Contains(sct, "varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci"), IsTrue, Commentf(sct))
+	// case: (utf8, utf8_general_ci, utf8mb4, utf8mb4_unicode_ci)
+	sct = showCreateTable("create table t(a varchar(10) binary charset utf8mb4 collate utf8mb4_unicode_ci) charset utf8 collate utf8_general_ci;")
+	c.Assert(strings.Contains(sct, "varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci"), IsTrue, Commentf(sct))
+	c.Assert(strings.Contains(sct, "ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci"), IsTrue, Commentf(sct))
+	// case: (nil, nil, binary, nil)
+	sct = showCreateTable("create table t(a varchar(10) binary charset binary);")
+	c.Assert(strings.Contains(sct, "varbinary(10) DEFAULT NULL"), IsTrue, Commentf(sct))
+	c.Assert(strings.Contains(sct, "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"), IsTrue, Commentf(sct))
+}
+
 func (s *testIntegrationSuite) TestIssue15743(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")
@@ -6990,6 +7041,18 @@ func (s *testIntegrationSerialSuite) TestIssue17891(c *C) {
 	tk.MustExec("create table test(id int, value set ('a','b','c') charset utf8mb4 collate utf8mb4_general_ci default 'a,B ,C');")
 }
 
+func (s *testIntegrationSerialSuite) TestIssue20268(c *C) {
+	collate.SetNewCollationEnabledForTest(true)
+	defer collate.SetNewCollationEnabledForTest(false)
+
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("CREATE TABLE `t` (   `a` enum('a','b') DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;")
+	tk.MustExec("insert into t values('a');")
+	tk.MustExec("select * from t where a = 'A';")
+}
+
 func (s *testIntegrationSerialSuite) TestIssue17233(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")
diff --git a/expression/scalar_function.go b/expression/scalar_function.go
old mode 100755
new mode 100644
diff --git a/expression/scalar_function_test.go b/expression/scalar_function_test.go
old mode 100755
new mode 100644
diff --git a/expression/testdata/flag_simplify_in.json b/expression/testdata/flag_simplify_in.json
new file mode 100644
index 0000000000000..807a2e59984aa
--- /dev/null
+++ b/expression/testdata/flag_simplify_in.json
@@ -0,0 +1,28 @@
+[
+  {
+    "name": "TestSimplifyExpressionByFlag",
+    "cases": [
+      "explain select * from t where a is null",
+      "explain select * from t where a is not null",
+      "explain select * from t where a > -1",
+      "explain select * from t where a <= -1",
+      "explain select * from t where a < 0",
+      "explain select * from t where a >= 0",
+      "explain select * from t where a = -1",
+      "explain select * from t where a <=> -1",
+      "explain select * from t where a != -1",
+      "explain select * from t where 0 > a",
+      "explain select * from t where 0 <= a",
+      "explain select * from t where -1 < a",
+      "explain select * from t where -1 >= a",
+      "explain select * from t where -1 = a",
+      "explain select * from t where -1 <=> a",
+      "explain select * from t where -1 != a",
+      // Tuples with null b should be filered out.
+      "explain select * from t where b >= 0",
+      "explain select * from t where b != -1",
+      // Int64 overflow corner case.
+      "explain select * from t where a = 0xFFFFFFFFFFFFFFFF"
+    ]
+  }
+]
diff --git a/expression/testdata/flag_simplify_out.json b/expression/testdata/flag_simplify_out.json
new file mode 100644
index 0000000000000..62090584486ba
--- /dev/null
+++ b/expression/testdata/flag_simplify_out.json
@@ -0,0 +1,134 @@
+[
+  {
+    "Name": "TestSimplifyExpressionByFlag",
+    "Cases": [
+      {
+        "SQL": "explain select * from t where a is null",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a is not null",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a > -1",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a <= -1",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a < 0",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a >= 0",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a = -1",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a <=> -1",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a != -1",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where 0 > a",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where 0 <= a",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where -1 < a",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where -1 >= a",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where -1 = a",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where -1 <=> a",
+        "Plan": [
+          "TableDual_6 0.00 root  rows:0"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where -1 != a",
+        "Plan": [
+          "TableReader_6 10000.00 root  data:TableFullScan_5",
+          "└─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where b >= 0",
+        "Plan": [
+          "TableReader_7 3333.33 root  data:Selection_6",
+          "└─Selection_6 3333.33 cop[tikv]  ge(test.t.b, 0)",
+          "  └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where b != -1",
+        "Plan": [
+          "TableReader_7 3333.33 root  data:Selection_6",
+          "└─Selection_6 3333.33 cop[tikv]  ne(test.t.b, -1)",
+          "  └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a = 0xFFFFFFFFFFFFFFFF",
+        "Plan": [
+          "TableReader_7 10.00 root  data:Selection_6",
+          "└─Selection_6 10.00 cop[tikv]  eq(test.t.a, 18446744073709551615)",
+          "  └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo"
+        ]
+      }
+    ]
+  }
+]
diff --git a/expression/testdata/partition_pruner_out.json b/expression/testdata/partition_pruner_out.json
index b3b34249c0108..02d188697d8a5 100644
--- a/expression/testdata/partition_pruner_out.json
+++ b/expression/testdata/partition_pruner_out.json
@@ -133,7 +133,7 @@
       {
         "SQL": "explain select * from t5 where d is null",
         "Result": [
-          "TableDual_5 0.00 root  rows:0"
+          "TableDual_6 0.00 root  rows:0"
         ]
       },
       {
diff --git a/expression/typeinfer_test.go b/expression/typeinfer_test.go
index 208eb9ca380ab..cc937c645014b 100644
--- a/expression/typeinfer_test.go
+++ b/expression/typeinfer_test.go
@@ -221,17 +221,17 @@ func (s *testInferTypeSuite) createTestCase4Columns() []typeInferTestCase {
 		{"c_time_d     ", mysql.TypeDuration, charset.CharsetBin, mysql.BinaryFlag, 10, 0},
 		{"c_timestamp  ", mysql.TypeTimestamp, charset.CharsetBin, mysql.BinaryFlag, 24, 4},
 		{"c_timestamp_d", mysql.TypeTimestamp, charset.CharsetBin, mysql.BinaryFlag, 19, 0},
-		{"c_char       ", mysql.TypeString, charset.CharsetUTF8MB4, 0, 20, 0}, // TODO: flag should be BinaryFlag
-		{"c_bchar      ", mysql.TypeString, charset.CharsetUTF8MB4, mysql.BinaryFlag, 20, 0},
-		{"c_varchar    ", mysql.TypeVarchar, charset.CharsetUTF8MB4, 0, 20, 0},                // TODO: BinaryFlag, tp should be TypeVarString
-		{"c_bvarchar   ", mysql.TypeVarchar, charset.CharsetUTF8MB4, mysql.BinaryFlag, 20, 0}, // TODO: BinaryFlag, tp should be TypeVarString
-		{"c_text_d     ", mysql.TypeBlob, charset.CharsetUTF8MB4, 0, 65535, 0},                // TODO: BlobFlag, BinaryFlag
-		{"c_btext_d    ", mysql.TypeBlob, charset.CharsetUTF8MB4, mysql.BinaryFlag, 65535, 0}, // TODO: BlobFlag, BinaryFlag
-		{"c_binary     ", mysql.TypeString, charset.CharsetBin, mysql.BinaryFlag, 20, 0},      // TODO: BinaryFlag
-		{"c_varbinary  ", mysql.TypeVarchar, charset.CharsetBin, mysql.BinaryFlag, 20, 0},     // TODO: BinaryFlag, tp should be TypeVarString
-		{"c_blob_d     ", mysql.TypeBlob, charset.CharsetBin, mysql.BinaryFlag, 65535, 0},     // TODO: BlobFlag, BinaryFlag
-		{"c_set        ", mysql.TypeSet, charset.CharsetUTF8MB4, 0, 5, 0},                     // TODO: SetFlag, BinaryFlag
-		{"c_enum       ", mysql.TypeEnum, charset.CharsetUTF8MB4, 0, 1, 0},                    // TODO: EnumFlag, BinaryFlag
+		{"c_char       ", mysql.TypeString, charset.CharsetUTF8MB4, 0, 20, 0},
+		{"c_bchar      ", mysql.TypeString, charset.CharsetUTF8MB4, 0, 20, 0},
+		{"c_varchar    ", mysql.TypeVarchar, charset.CharsetUTF8MB4, 0, 20, 0}, // TODO: tp should be TypeVarString
+		{"c_bvarchar   ", mysql.TypeVarchar, charset.CharsetUTF8MB4, 0, 20, 0}, // TODO: tp should be TypeVarString
+		{"c_text_d     ", mysql.TypeBlob, charset.CharsetUTF8MB4, 0, 65535, 0}, // TODO: BlobFlag
+		{"c_btext_d    ", mysql.TypeBlob, charset.CharsetUTF8MB4, 0, 65535, 0}, // TODO: BlobFlag
+		{"c_binary     ", mysql.TypeString, charset.CharsetBin, mysql.BinaryFlag, 20, 0},
+		{"c_varbinary  ", mysql.TypeVarchar, charset.CharsetBin, mysql.BinaryFlag, 20, 0}, // TODO: tp should be TypeVarString
+		{"c_blob_d     ", mysql.TypeBlob, charset.CharsetBin, mysql.BinaryFlag, 65535, 0}, // TODO: BlobFlag
+		{"c_set        ", mysql.TypeSet, charset.CharsetUTF8MB4, 0, 5, 0},                 // TODO: SetFlag
+		{"c_enum       ", mysql.TypeEnum, charset.CharsetUTF8MB4, 0, 1, 0},                // TODO: EnumFlag
 	}
 }
 
@@ -240,7 +240,7 @@ func (s *testInferTypeSuite) createTestCase4StrFuncs() []typeInferTestCase {
 		{"strcmp(c_char, c_char)", mysql.TypeLonglong, charset.CharsetBin, mysql.BinaryFlag, 2, 0},
 		{"space(c_int_d)", mysql.TypeLongBlob, mysql.DefaultCharset, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
 		{"CONCAT(c_binary, c_int_d)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 40, types.UnspecifiedLength},
-		{"CONCAT(c_bchar, c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, mysql.BinaryFlag, 40, types.UnspecifiedLength},
+		{"CONCAT(c_bchar, c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 40, types.UnspecifiedLength},
 		{"CONCAT('T', 'i', 'DB')", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 4, types.UnspecifiedLength},
 		{"CONCAT('T', 'i', 'DB', c_binary)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 24, types.UnspecifiedLength},
 		{"CONCAT_WS('-', 'T', 'i', 'DB')", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 6, types.UnspecifiedLength},
@@ -1122,7 +1122,7 @@ func (s *testInferTypeSuite) createTestCase4Miscellaneous() []typeInferTestCase
 		{"any_value(c_time_d)", mysql.TypeDuration, charset.CharsetBin, mysql.BinaryFlag, 10, 0},
 		{"any_value(c_timestamp_d)", mysql.TypeTimestamp, charset.CharsetUTF8MB4, 0, 19, 0},
 		{"any_value(c_char)", mysql.TypeString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
-		{"any_value(c_bchar)", mysql.TypeString, charset.CharsetUTF8MB4, mysql.BinaryFlag, 20, types.UnspecifiedLength},
+		{"any_value(c_bchar)", mysql.TypeString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
 		{"any_value(c_varchar)", mysql.TypeVarchar, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
 		{"any_value(c_text_d)", mysql.TypeBlob, charset.CharsetUTF8MB4, 0, 65535, types.UnspecifiedLength},
 		{"any_value(c_binary)", mysql.TypeString, charset.CharsetBin, mysql.BinaryFlag, 20, types.UnspecifiedLength},
diff --git a/go.mod b/go.mod
index 74c870fed9007..fd896eade4824 100644
--- a/go.mod
+++ b/go.mod
@@ -23,7 +23,7 @@ require (
 	github.com/klauspost/cpuid v1.2.1
 	github.com/ngaut/pools v0.0.0-20180318154953-b7bc8c42aac7
 	github.com/ngaut/sync2 v0.0.0-20141008032647-7a24ed77b2ef
-	github.com/ngaut/unistore v0.0.0-20200918091209-68a2db6bb775
+	github.com/ngaut/unistore v0.0.0-20200929093420-76a7b18be28e
 	github.com/opentracing/basictracer-go v1.0.0
 	github.com/opentracing/opentracing-go v1.1.0
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
@@ -36,7 +36,7 @@ require (
 	github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989
 	github.com/pingcap/kvproto v0.0.0-20200828054126-d677e6fd224a
 	github.com/pingcap/log v0.0.0-20200828042413-fce0951f1463
-	github.com/pingcap/parser v0.0.0-20200929032957-9678b2b7cefb
+	github.com/pingcap/parser v0.0.0-20201014065945-fb6bde872a79
 	github.com/pingcap/sysutil v0.0.0-20200715082929-4c47bcac246a
 	github.com/pingcap/tidb-tools v4.0.5-0.20200820092506-34ea90c93237+incompatible
 	github.com/pingcap/tipb v0.0.0-20200618092958-4fad48b4c8c3
@@ -63,6 +63,7 @@ require (
 	golang.org/x/tools v0.0.0-20200820010801-b793a1359eac
 	google.golang.org/grpc v1.26.0
 	gopkg.in/natefinch/lumberjack.v2 v2.0.0
+	honnef.co/go/tools v0.0.1-2020.1.6 // indirect
 	sourcegraph.com/sourcegraph/appdash v0.0.0-20180531100431-4c381bd170b4
 	sourcegraph.com/sourcegraph/appdash-data v0.0.0-20151005221446-73f23eafcf67
 )
diff --git a/go.sum b/go.sum
index 64d2e1dcd7886..e250cefda157b 100644
--- a/go.sum
+++ b/go.sum
@@ -401,8 +401,8 @@ github.com/ngaut/unistore v0.0.0-20200803051709-607d96233b1d/go.mod h1:2QAH8tXCj
 github.com/ngaut/unistore v0.0.0-20200806113332-5b9f73333a19/go.mod h1:RtZJKyiaHRiII+b9/g/4339rSikSvfrUJmIbrUkYVi4=
 github.com/ngaut/unistore v0.0.0-20200820080223-c734bcc4ea53/go.mod h1:85S5ZgzoHtTMyaEYhaWnxv9OWMBfyhTNuWypXCfVn/0=
 github.com/ngaut/unistore v0.0.0-20200828072424-1c0ede06a3fc/go.mod h1:iSlx5Ub/926GvQn6+d2B2C16wJJwgQIsi6k/bEU0vl4=
-github.com/ngaut/unistore v0.0.0-20200918091209-68a2db6bb775 h1:9z7ZQ//+b6DjI79ak0sNf7RMgmjYh/BTB+NkipfdLiM=
-github.com/ngaut/unistore v0.0.0-20200918091209-68a2db6bb775/go.mod h1:ZR3NH+HzqfiYetwdoAivApnIy8iefPZHTMLfrFNm8g4=
+github.com/ngaut/unistore v0.0.0-20200929093420-76a7b18be28e h1:1a8YbLM1sBmwEjzEVT/JD12Vjf6BNnBBEUV3nAcZYKU=
+github.com/ngaut/unistore v0.0.0-20200929093420-76a7b18be28e/go.mod h1:ZR3NH+HzqfiYetwdoAivApnIy8iefPZHTMLfrFNm8g4=
 github.com/nicksnyder/go-i18n v1.10.0/go.mod h1:HrK7VCrbOvQoUAQ7Vpy7i87N7JZZZ7R2xBGjv0j365Q=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/olekukonko/tablewriter v0.0.0-20170122224234-a0225b3f23b5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
@@ -507,8 +507,8 @@ github.com/pingcap/parser v0.0.0-20200730092557-34a468e9b774/go.mod h1:vQdbJqobJ
 github.com/pingcap/parser v0.0.0-20200731033026-84f62115187c/go.mod h1:vQdbJqobJAgFyiRNNtXahpMoGWwPEuWciVEK5A20NS0=
 github.com/pingcap/parser v0.0.0-20200813083329-a4bff035d3e2/go.mod h1:vQdbJqobJAgFyiRNNtXahpMoGWwPEuWciVEK5A20NS0=
 github.com/pingcap/parser v0.0.0-20200821073936-cf85e80665c4/go.mod h1:vQdbJqobJAgFyiRNNtXahpMoGWwPEuWciVEK5A20NS0=
-github.com/pingcap/parser v0.0.0-20200929032957-9678b2b7cefb h1:Nlswd41UZDaedHNysE/lb8dc3EpmWAApf480qU2N3nU=
-github.com/pingcap/parser v0.0.0-20200929032957-9678b2b7cefb/go.mod h1:RlLfMRJwFBSiXd2lUaWdV5pSXtrpyvZM8k5bbZWsheU=
+github.com/pingcap/parser v0.0.0-20201014065945-fb6bde872a79 h1:Dcxi/lDJ6C3M5ocRbhR66MBDMmqFkPVt/Y79DVb5QR8=
+github.com/pingcap/parser v0.0.0-20201014065945-fb6bde872a79/go.mod h1:RlLfMRJwFBSiXd2lUaWdV5pSXtrpyvZM8k5bbZWsheU=
 github.com/pingcap/pd/v4 v4.0.0-rc.1.0.20200422143320-428acd53eba2/go.mod h1:s+utZtXDznOiL24VK0qGmtoHjjXNsscJx3m1n8cC56s=
 github.com/pingcap/pd/v4 v4.0.0-rc.2.0.20200520083007-2c251bd8f181/go.mod h1:q4HTx/bA8aKBa4S7L+SQKHvjRPXCRV0tA0yRw0qkZSA=
 github.com/pingcap/pd/v4 v4.0.0-rc.2.0.20200714122454-1a64f969cb3c/go.mod h1:v/dY4mVkt3dh/Liphhk0E4ScOkZpIk0m0GvWJ9FapDs=
@@ -889,6 +889,7 @@ golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapK
 golang.org/x/tools v0.0.0-20200225230052-807dcd883420/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200325010219-a49f79bcc224/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
 golang.org/x/tools v0.0.0-20200325203130-f53864d0dba1/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
+golang.org/x/tools v0.0.0-20200410194907-79a7a3126eef/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200521211927-2b542361a4fc/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200527183253-8e7acdbce89d/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200820010801-b793a1359eac h1:DugppSxw0LSF8lcjaODPJZoDzq0ElTGskTst3ZaBkHI=
@@ -980,6 +981,8 @@ honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.5 h1:nI5egYTGJakVyOryqLs1cQO5dO0ksin5XXs2pspk75k=
 honnef.co/go/tools v0.0.1-2020.1.5/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.6 h1:W18jzjh8mfPez+AwGLxmOImucz/IFjpNlrKVnaj2YVc=
+honnef.co/go/tools v0.0.1-2020.1.6/go.mod h1:pyyisuGw24ruLjrr1ddx39WE0y9OooInRzEYLhQB2YY=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
diff --git a/hooks/pre-commit b/hooks/pre-commit
index 065abcf0d6ddd..c10007e65031a 100755
--- a/hooks/pre-commit
+++ b/hooks/pre-commit
@@ -5,7 +5,7 @@
 # The PR is https://github.com/kubernetes/kubernetes/pull/47673
 
 # How to use this hook?
-# ln -s hooks/pre-commit .git/hooks/
+# ln -s ../../hooks/pre-commit .git/hooks/pre-commit
 # In case hook is not executable
 # chmod +x .git/hooks/pre-commit
 
diff --git a/infoschema/builder.go b/infoschema/builder.go
index 146dd6298b764..deff4979a8b21 100644
--- a/infoschema/builder.go
+++ b/infoschema/builder.go
@@ -83,7 +83,9 @@ func (b *Builder) ApplyDiff(m *meta.Meta, diff *model.SchemaDiff) ([]int64, erro
 			// For normal node's information schema, repaired table is existed.
 			// For repair node's information schema, repaired table is filtered (couldn't find it in `is`).
 			// So here skip to reserve the allocators when repairing table.
-			diff.Type != model.ActionRepairTable {
+			diff.Type != model.ActionRepairTable &&
+			// Alter sequence will change the sequence info in the allocator, so the old allocator is not valid any more.
+			diff.Type != model.ActionAlterSequence {
 			oldAllocs, _ := b.is.AllocByID(oldTableID)
 			allocs = filterAllocators(diff, oldAllocs)
 		}
diff --git a/infoschema/metric_table_def.go b/infoschema/metric_table_def.go
index f74820d6f1055..82146bb87ef5b 100644
--- a/infoschema/metric_table_def.go
+++ b/infoschema/metric_table_def.go
@@ -605,8 +605,8 @@ var MetricTableMap = map[string]MetricTableDef{
 	},
 	"tidb_gc_duration": {
 		Comment:  "The quantile of kv storage garbage collection time durations",
-		PromQL:   "histogram_quantile($QUANTILE, sum(rate(tidb_tikvclient_gc_seconds_bucket{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (le,instance))",
-		Labels:   []string{"instance"},
+		PromQL:   "histogram_quantile($QUANTILE, sum(rate(tidb_tikvclient_gc_seconds_bucket{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (le,instance,stage))",
+		Labels:   []string{"instance", "stage"},
 		Quantile: 0.95,
 	},
 	"tidb_gc_config": {
@@ -2522,13 +2522,13 @@ var MetricTableMap = map[string]MetricTableDef{
 		Comment: "The total time of kv storage range worker processing one task duration",
 	},
 	"tidb_gc_total_count": {
-		PromQL:  "sum(increase(tidb_tikvclient_gc_seconds_count{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (instance)",
-		Labels:  []string{"instance"},
+		PromQL:  "sum(increase(tidb_tikvclient_gc_seconds_count{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (instance,stage)",
+		Labels:  []string{"instance", "stage"},
 		Comment: "The total count of kv storage garbage collection",
 	},
 	"tidb_gc_total_time": {
-		PromQL:  "sum(increase(tidb_tikvclient_gc_seconds_sum{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (instance)",
-		Labels:  []string{"instance"},
+		PromQL:  "sum(increase(tidb_tikvclient_gc_seconds_sum{$LABEL_CONDITIONS}[$RANGE_DURATION])) by (instance,stage)",
+		Labels:  []string{"instance", "stage"},
 		Comment: "The total time of kv storage garbage collection time durations",
 	},
 	"tidb_get_token_total_count": {
diff --git a/infoschema/tables.go b/infoschema/tables.go
old mode 100755
new mode 100644
diff --git a/meta/autoid/autoid.go b/meta/autoid/autoid.go
old mode 100755
new mode 100644
diff --git a/meta/meta.go b/meta/meta.go
index 539a39f1cb730..7d559d11d6ff1 100644
--- a/meta/meta.go
+++ b/meta/meta.go
@@ -381,6 +381,22 @@ func (m *Meta) CreateSequenceAndSetSeqValue(dbID int64, tableInfo *model.TableIn
 	return errors.Trace(err)
 }
 
+// RestartSequenceValue resets the the sequence value.
+func (m *Meta) RestartSequenceValue(dbID int64, tableInfo *model.TableInfo, seqValue int64) error {
+	// Check if db exists.
+	dbKey := m.dbKey(dbID)
+	if err := m.checkDBExists(dbKey); err != nil {
+		return errors.Trace(err)
+	}
+
+	// Check if table exists.
+	tableKey := m.tableKey(tableInfo.ID)
+	if err := m.checkTableExists(dbKey, tableKey); err != nil {
+		return errors.Trace(err)
+	}
+	return errors.Trace(m.txn.HSet(m.dbKey(dbID), m.sequenceKey(tableInfo.ID), []byte(strconv.FormatInt(seqValue, 10))))
+}
+
 // DropDatabase drops whole database.
 func (m *Meta) DropDatabase(dbID int64) error {
 	// Check if db exists.
diff --git a/metrics/session.go b/metrics/session.go
index 4838ee771ac8b..feb38783ce161 100644
--- a/metrics/session.go
+++ b/metrics/session.go
@@ -142,4 +142,5 @@ const (
 	LblAddress     = "address"
 	LblBatchGet    = "batch_get"
 	LblGet         = "get"
+	LblLockKeys    = "lock_keys"
 )
diff --git a/planner/core/cbo_test.go b/planner/core/cbo_test.go
index 5ee932438bed0..ee857e8e44881 100644
--- a/planner/core/cbo_test.go
+++ b/planner/core/cbo_test.go
@@ -928,3 +928,35 @@ func (s *testAnalyzeSuite) TestIndexEqualUnknown(c *C) {
 		testKit.MustQuery(tt).Check(testkit.Rows(output[i].Plan...))
 	}
 }
+
+func (s *testAnalyzeSuite) TestLimitIndexEstimation(c *C) {
+	defer testleak.AfterTest(c)()
+	store, dom, err := newStoreWithBootstrap()
+	c.Assert(err, IsNil)
+	tk := testkit.NewTestKit(c, store)
+	defer func() {
+		dom.Close()
+		store.Close()
+	}()
+
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int, b int, key idx_a(a), key idx_b(b))")
+	// Values in column a are from 1 to 1000000, values in column b are from 1000000 to 1,
+	// these 2 columns are strictly correlated in reverse order.
+	err = s.loadTableStats("analyzeSuiteTestLimitIndexEstimationT.json", dom)
+	c.Assert(err, IsNil)
+	var input []string
+	var output []struct {
+		SQL  string
+		Plan []string
+	}
+	s.testData.GetTestCases(c, &input, &output)
+	for i, tt := range input {
+		s.testData.OnRecord(func() {
+			output[i].SQL = tt
+			output[i].Plan = s.testData.ConvertRowsToStrings(tk.MustQuery(tt).Rows())
+		})
+		tk.MustQuery(tt).Check(testkit.Rows(output[i].Plan...))
+	}
+}
diff --git a/planner/core/exhaust_physical_plans.go b/planner/core/exhaust_physical_plans.go
index b6db7043b9c4b..3b67e8f66fd78 100644
--- a/planner/core/exhaust_physical_plans.go
+++ b/planner/core/exhaust_physical_plans.go
@@ -29,6 +29,7 @@ import (
 	"github.com/pingcap/tidb/planner/property"
 	"github.com/pingcap/tidb/planner/util"
 	"github.com/pingcap/tidb/sessionctx"
+	"github.com/pingcap/tidb/statistics"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/collate"
@@ -622,7 +623,10 @@ func (p *LogicalJoin) getIndexJoinByOuterIdx(prop *property.PhysicalProperty, ou
 
 func (p *LogicalJoin) getIndexJoinBuildHelper(ds *DataSource, innerJoinKeys []*expression.Column,
 	checkPathValid func(path *util.AccessPath) bool) (*indexJoinBuildHelper, []int) {
-	helper := &indexJoinBuildHelper{join: p}
+	helper := &indexJoinBuildHelper{
+		join:      p,
+		innerPlan: ds,
+	}
 	for _, path := range ds.possibleAccessPaths {
 		if checkPathValid(path) {
 			emptyRange, err := helper.analyzeLookUpFilters(path, ds, innerJoinKeys)
@@ -741,7 +745,7 @@ func (p *LogicalJoin) buildIndexJoinInner2IndexScan(
 	joins = make([]PhysicalPlan, 0, 3)
 	rangeInfo := helper.buildRangeDecidedByInformation(helper.chosenPath.IdxCols, outerJoinKeys)
 	maxOneRow := false
-	if helper.chosenPath.Index.Unique && helper.maxUsedCols == len(helper.chosenPath.FullIdxCols) {
+	if helper.chosenPath.Index.Unique && helper.usedColsLen == len(helper.chosenPath.FullIdxCols) {
 		l := len(helper.chosenAccess)
 		if l == 0 {
 			maxOneRow = true
@@ -774,10 +778,12 @@ func (p *LogicalJoin) buildIndexJoinInner2IndexScan(
 }
 
 type indexJoinBuildHelper struct {
-	join *LogicalJoin
+	join      *LogicalJoin
+	innerPlan *DataSource
 
 	chosenIndexInfo *model.IndexInfo
-	maxUsedCols     int
+	usedColsLen     int
+	usedColsNDV     float64
 	chosenAccess    []expression.Expression
 	chosenRemained  []expression.Expression
 	idxOff2KeyOff   []int
@@ -1272,7 +1278,7 @@ func (ijHelper *indexJoinBuildHelper) analyzeLookUpFilters(path *util.AccessPath
 		if emptyRange {
 			return true, nil
 		}
-		ijHelper.updateBestChoice(ranges, path, accesses, remained, nil)
+		ijHelper.updateBestChoice(ranges, path, accesses, remained, nil, lastColPos)
 		return false, nil
 	}
 	lastPossibleCol := path.IdxCols[lastColPos]
@@ -1311,7 +1317,10 @@ func (ijHelper *indexJoinBuildHelper) analyzeLookUpFilters(path *util.AccessPath
 			remained = append(remained, colAccesses...)
 		}
 		accesses = append(accesses, colAccesses...)
-		ijHelper.updateBestChoice(ranges, path, accesses, remained, nil)
+		if len(colAccesses) > 0 {
+			lastColPos = lastColPos + 1
+		}
+		ijHelper.updateBestChoice(ranges, path, accesses, remained, nil, lastColPos)
 		return false, nil
 	}
 	accesses = append(accesses, lastColAccess...)
@@ -1323,24 +1332,38 @@ func (ijHelper *indexJoinBuildHelper) analyzeLookUpFilters(path *util.AccessPath
 	if emptyRange {
 		return true, nil
 	}
-	ijHelper.updateBestChoice(ranges, path, accesses, remained, lastColManager)
+	ijHelper.updateBestChoice(ranges, path, accesses, remained, lastColManager, lastColPos+1)
 	return false, nil
 }
 
 func (ijHelper *indexJoinBuildHelper) updateBestChoice(ranges []*ranger.Range, path *util.AccessPath, accesses,
-	remained []expression.Expression, lastColManager *ColWithCmpFuncManager) {
-	// We choose the index by the number of used columns of the range, the much the better.
-	// Notice that there may be the cases like `t1.a=t2.a and b > 2 and b < 1`. So ranges can be nil though the conditions are valid.
-	// But obviously when the range is nil, we don't need index join.
-	if len(ranges) > 0 && len(ranges[0].LowVal) > ijHelper.maxUsedCols {
-		ijHelper.chosenPath = path
-		ijHelper.maxUsedCols = len(ranges[0].LowVal)
-		ijHelper.chosenRanges = ranges
-		ijHelper.chosenAccess = accesses
-		ijHelper.chosenRemained = remained
-		ijHelper.idxOff2KeyOff = ijHelper.curIdxOff2KeyOff
-		ijHelper.lastColManager = lastColManager
+	remained []expression.Expression, lastColManager *ColWithCmpFuncManager, usedColsLen int) {
+	// Notice that there may be the cases like `t1.a = t2.a and b > 2 and b < 1`, so ranges can be nil though the conditions are valid.
+	// Obviously when the range is nil, we don't need index join.
+	if len(ranges) == 0 {
+		return
+	}
+	var innerNDV float64
+	if stats := ijHelper.innerPlan.statsInfo(); stats != nil && stats.StatsVersion != statistics.PseudoVersion {
+		innerNDV = getCardinality(path.IdxCols[:usedColsLen], ijHelper.innerPlan.Schema(), stats)
+	}
+	// We choose the index by the NDV of the used columns, the larger the better.
+	// If NDVs are same, we choose index which uses more columns.
+	// Note that these 2 heuristic rules are too simple to cover all cases,
+	// since the NDV of outer join keys are not considered, and the detached access conditions
+	// may contain expressions like `t1.a > t2.a`. It's pretty hard to evaluate the join selectivity
+	// of these non-column-equal conditions, so I prefer to keep these heuristic rules simple at least for now.
+	if innerNDV < ijHelper.usedColsNDV || (innerNDV == ijHelper.usedColsNDV && usedColsLen <= ijHelper.usedColsLen) {
+		return
 	}
+	ijHelper.chosenPath = path
+	ijHelper.usedColsLen = len(ranges[0].LowVal)
+	ijHelper.usedColsNDV = innerNDV
+	ijHelper.chosenRanges = ranges
+	ijHelper.chosenAccess = accesses
+	ijHelper.chosenRemained = remained
+	ijHelper.idxOff2KeyOff = ijHelper.curIdxOff2KeyOff
+	ijHelper.lastColManager = lastColManager
 }
 
 func (ijHelper *indexJoinBuildHelper) buildTemplateRange(matchedKeyCnt int, eqAndInFuncs []expression.Expression, nextColRange []*ranger.Range, haveExtraCol bool) (ranges []*ranger.Range, emptyRange bool, err error) {
@@ -1879,7 +1902,7 @@ func (la *LogicalAggregation) getEnforcedStreamAggs(prop *property.PhysicalPrope
 	childProp := &property.PhysicalProperty{
 		ExpectedCnt: math.Max(prop.ExpectedCnt*la.inputCount/la.stats.RowCount, prop.ExpectedCnt),
 		Enforced:    true,
-		Items:       property.ItemsFromCols(la.groupByCols, desc),
+		Items:       property.ItemsFromCols(la.GetGroupByCols(), desc),
 	}
 	if !prop.IsPrefix(childProp) {
 		return enforcedAggs
@@ -1938,7 +1961,8 @@ func (la *LogicalAggregation) getStreamAggs(prop *property.PhysicalProperty) []P
 		}
 	}
 	// group by a + b is not interested in any order.
-	if len(la.groupByCols) != len(la.GroupByItems) {
+	groupByCols := la.GetGroupByCols()
+	if len(groupByCols) != len(la.GroupByItems) {
 		return nil
 	}
 
@@ -1949,7 +1973,7 @@ func (la *LogicalAggregation) getStreamAggs(prop *property.PhysicalProperty) []P
 	}
 
 	for _, possibleChildProperty := range la.possibleProperties {
-		childProp.Items = property.ItemsFromCols(possibleChildProperty[:len(la.groupByCols)], desc)
+		childProp.Items = property.ItemsFromCols(possibleChildProperty[:len(groupByCols)], desc)
 		if !prop.IsPrefix(childProp) {
 			continue
 		}
diff --git a/planner/core/exhaust_physical_plans_test.go b/planner/core/exhaust_physical_plans_test.go
index c3569527df786..df5a83dffb1f1 100644
--- a/planner/core/exhaust_physical_plans_test.go
+++ b/planner/core/exhaust_physical_plans_test.go
@@ -21,7 +21,9 @@ import (
 	"github.com/pingcap/parser/model"
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/expression"
+	"github.com/pingcap/tidb/planner/property"
 	"github.com/pingcap/tidb/planner/util"
+	"github.com/pingcap/tidb/statistics"
 	"github.com/pingcap/tidb/types"
 )
 
@@ -82,6 +84,7 @@ func (s *testUnitTestSuit) TestIndexJoinAnalyzeLookUpFilters(c *C) {
 		DBName:  model.NewCIStr("test"),
 	})
 	dataSourceNode.schema = dsSchema
+	dataSourceNode.stats = &property.StatsInfo{StatsVersion: statistics.PseudoVersion}
 	outerChildSchema := expression.NewSchema()
 	var outerChildNames types.NameSlice
 	outerChildSchema.Append(&expression.Column{
@@ -244,7 +247,7 @@ func (s *testUnitTestSuit) TestIndexJoinAnalyzeLookUpFilters(c *C) {
 		others, err := s.rewriteSimpleExpr(tt.otherConds, joinNode.schema, joinColNames)
 		c.Assert(err, IsNil)
 		joinNode.OtherConditions = others
-		helper := &indexJoinBuildHelper{join: joinNode, lastColManager: nil}
+		helper := &indexJoinBuildHelper{join: joinNode, lastColManager: nil, innerPlan: dataSourceNode}
 		_, err = helper.analyzeLookUpFilters(path, dataSourceNode, tt.innerKeys)
 		c.Assert(err, IsNil)
 		c.Assert(fmt.Sprintf("%v", helper.chosenAccess), Equals, tt.accesses)
diff --git a/planner/core/find_best_task.go b/planner/core/find_best_task.go
index ec5e5192cfbfd..c6a2ae423e8cc 100644
--- a/planner/core/find_best_task.go
+++ b/planner/core/find_best_task.go
@@ -1182,9 +1182,9 @@ func (ds *DataSource) splitIndexFilterConditions(conditions []expression.Express
 	return indexConditions, tableConditions
 }
 
-// getMostCorrColFromExprs checks if column in the condition is correlated enough with handle. If the condition
+// getMostCorrCol4Handle checks if column in the condition is correlated enough with handle. If the condition
 // contains multiple columns, return nil and get the max correlation, which would be used in the heuristic estimation.
-func getMostCorrColFromExprs(exprs []expression.Expression, histColl *statistics.Table, threshold float64) (*expression.Column, float64) {
+func getMostCorrCol4Handle(exprs []expression.Expression, histColl *statistics.Table, threshold float64) (*expression.Column, float64) {
 	var cols []*expression.Column
 	cols = expression.ExtractColumnsFromExpressions(cols, exprs, nil)
 	if len(cols) == 0 {
@@ -1202,13 +1202,13 @@ func getMostCorrColFromExprs(exprs []expression.Expression, histColl *statistics
 		if !ok {
 			continue
 		}
-		curCorr := math.Abs(hist.Correlation)
-		if corrCol == nil || corr < curCorr {
+		curCorr := hist.Correlation
+		if corrCol == nil || math.Abs(corr) < math.Abs(curCorr) {
 			corrCol = col
 			corr = curCorr
 		}
 	}
-	if len(colSet) == 1 && corr >= threshold {
+	if len(colSet) == 1 && math.Abs(corr) >= threshold {
 		return corrCol, corr
 	}
 	return nil, corr
@@ -1273,28 +1273,31 @@ func convertRangeFromExpectedCnt(ranges []*ranger.Range, rangeCounts []float64,
 	return convertedRanges, count, false
 }
 
-// crossEstimateRowCount estimates row count of table scan using histogram of another column which is in TableFilters
+// crossEstimateTableRowCount estimates row count of table scan using histogram of another column which is in TableFilters
 // and has high order correlation with handle column. For example, if the query is like:
 // `select * from tbl where a = 1 order by pk limit 1`
 // if order of column `a` is strictly correlated with column `pk`, the row count of table scan should be:
 // `1 + row_count(a < 1 or a is null)`
-func (ds *DataSource) crossEstimateRowCount(path *util.AccessPath, expectedCnt float64, desc bool) (float64, bool, float64) {
+func (ds *DataSource) crossEstimateTableRowCount(path *util.AccessPath, expectedCnt float64, desc bool) (float64, bool, float64) {
 	if ds.statisticTable.Pseudo || len(path.TableFilters) == 0 {
 		return 0, false, 0
 	}
-	col, corr := getMostCorrColFromExprs(path.TableFilters, ds.statisticTable, ds.ctx.GetSessionVars().CorrelationThreshold)
-	// If table scan is not full range scan, we cannot use histogram of other columns for estimation, because
+	col, corr := getMostCorrCol4Handle(path.TableFilters, ds.statisticTable, ds.ctx.GetSessionVars().CorrelationThreshold)
+	return ds.crossEstimateRowCount(path, path.TableFilters, col, corr, expectedCnt, desc)
+}
+
+// crossEstimateRowCount is the common logic of crossEstimateTableRowCount and crossEstimateIndexRowCount.
+func (ds *DataSource) crossEstimateRowCount(path *util.AccessPath, conds []expression.Expression, col *expression.Column, corr, expectedCnt float64, desc bool) (float64, bool, float64) {
+	// If the scan is not full range scan, we cannot use histogram of other columns for estimation, because
 	// the histogram reflects value distribution in the whole table level.
 	if col == nil || len(path.AccessConds) > 0 {
 		return 0, false, corr
 	}
-	colInfoID := col.ID
-	colID := col.UniqueID
-	colHist := ds.statisticTable.Columns[colInfoID]
-	if colHist.Correlation < 0 {
+	colInfoID, colID := col.ID, col.UniqueID
+	if corr < 0 {
 		desc = !desc
 	}
-	accessConds, remained := ranger.DetachCondsForColumn(ds.ctx, path.TableFilters, col)
+	accessConds, remained := ranger.DetachCondsForColumn(ds.ctx, conds, col)
 	if len(accessConds) == 0 {
 		return 0, false, corr
 	}
@@ -1332,6 +1335,62 @@ func (ds *DataSource) crossEstimateRowCount(path *util.AccessPath, expectedCnt f
 	return scanCount, true, 0
 }
 
+// crossEstimateIndexRowCount estimates row count of index scan using histogram of another column which is in TableFilters/IndexFilters
+// and has high order correlation with the first index column. For example, if the query is like:
+// `select * from tbl where a = 1 order by b limit 1`
+// if order of column `a` is strictly correlated with column `b`, the row count of IndexScan(b) should be:
+// `1 + row_count(a < 1 or a is null)`
+func (ds *DataSource) crossEstimateIndexRowCount(path *util.AccessPath, expectedCnt float64, desc bool) (float64, bool, float64) {
+	filtersLen := len(path.TableFilters) + len(path.IndexFilters)
+	if ds.statisticTable.Pseudo || filtersLen == 0 {
+		return 0, false, 0
+	}
+	col, corr := getMostCorrCol4Index(path, ds.statisticTable, ds.ctx.GetSessionVars().CorrelationThreshold)
+	filters := make([]expression.Expression, 0, filtersLen)
+	filters = append(filters, path.TableFilters...)
+	filters = append(filters, path.IndexFilters...)
+	return ds.crossEstimateRowCount(path, filters, col, corr, expectedCnt, desc)
+}
+
+// getMostCorrCol4Index checks if column in the condition is correlated enough with the first index column. If the condition
+// contains multiple columns, return nil and get the max correlation, which would be used in the heuristic estimation.
+func getMostCorrCol4Index(path *util.AccessPath, histColl *statistics.Table, threshold float64) (*expression.Column, float64) {
+	if histColl.ExtendedStats == nil || len(histColl.ExtendedStats.Stats) == 0 {
+		return nil, 0
+	}
+	var cols []*expression.Column
+	cols = expression.ExtractColumnsFromExpressions(cols, path.TableFilters, nil)
+	cols = expression.ExtractColumnsFromExpressions(cols, path.IndexFilters, nil)
+	if len(cols) == 0 {
+		return nil, 0
+	}
+	colSet := set.NewInt64Set()
+	var corr float64
+	var corrCol *expression.Column
+	for _, col := range cols {
+		if colSet.Exist(col.UniqueID) {
+			continue
+		}
+		colSet.Insert(col.UniqueID)
+		curCorr := float64(0)
+		for _, item := range histColl.ExtendedStats.Stats {
+			if (col.ID == item.ColIDs[0] && path.FullIdxCols[0].ID == item.ColIDs[1]) ||
+				(col.ID == item.ColIDs[1] && path.FullIdxCols[0].ID == item.ColIDs[0]) {
+				curCorr = item.ScalarVals
+				break
+			}
+		}
+		if corrCol == nil || math.Abs(corr) < math.Abs(curCorr) {
+			corrCol = col
+			corr = curCorr
+		}
+	}
+	if len(colSet) == 1 && math.Abs(corr) >= threshold {
+		return corrCol, corr
+	}
+	return nil, corr
+}
+
 // GetPhysicalScan returns PhysicalTableScan for the LogicalTableScan.
 func (s *LogicalTableScan) GetPhysicalScan(schema *expression.Schema, stats *property.StatsInfo) *PhysicalTableScan {
 	ds := s.Source
@@ -1608,7 +1667,7 @@ func (ds *DataSource) getOriginalPhysicalTableScan(prop *property.PhysicalProper
 	}
 	rowCount := path.CountAfterAccess
 	if prop.ExpectedCnt < ds.stats.RowCount {
-		count, ok, corr := ds.crossEstimateRowCount(path, prop.ExpectedCnt, isMatchProp && prop.Items[0].Desc)
+		count, ok, corr := ds.crossEstimateTableRowCount(path, prop.ExpectedCnt, isMatchProp && prop.Items[0].Desc)
 		if ok {
 			// TODO: actually, before using this count as the estimated row count of table scan, we need additionally
 			// check if count < row_count(first_region | last_region), and use the larger one since we build one copTask
@@ -1618,8 +1677,8 @@ func (ds *DataSource) getOriginalPhysicalTableScan(prop *property.PhysicalProper
 			// Considering that when this scenario happens, the execution time is close between IndexScan and TableScan,
 			// we do not add this check temporarily.
 			rowCount = count
-		} else if corr < 1 {
-			correlationFactor := math.Pow(1-corr, float64(ds.ctx.GetSessionVars().CorrelationExpFactor))
+		} else if abs := math.Abs(corr); abs < 1 {
+			correlationFactor := math.Pow(1-abs, float64(ds.ctx.GetSessionVars().CorrelationExpFactor))
 			selectivity := ds.stats.RowCount / rowCount
 			rowCount = math.Min(prop.ExpectedCnt/selectivity/correlationFactor, rowCount)
 		}
@@ -1681,12 +1740,15 @@ func (ds *DataSource) getOriginalPhysicalIndexScan(prop *property.PhysicalProper
 	}
 	rowCount := path.CountAfterAccess
 	is.initSchema(append(path.FullIdxCols, ds.commonHandleCols...), !isSingleScan)
-	// Only use expectedCnt when it's smaller than the count we calculated.
-	// e.g. IndexScan(count1)->After Filter(count2). The `ds.stats.RowCount` is count2. count1 is the one we need to calculate
-	// If expectedCnt and count2 are both zero and we go into the below `if` block, the count1 will be set to zero though it's shouldn't be.
 	if (isMatchProp || prop.IsEmpty()) && prop.ExpectedCnt < ds.stats.RowCount {
-		selectivity := ds.stats.RowCount / path.CountAfterAccess
-		rowCount = math.Min(prop.ExpectedCnt/selectivity, rowCount)
+		count, ok, corr := ds.crossEstimateIndexRowCount(path, prop.ExpectedCnt, isMatchProp && prop.Items[0].Desc)
+		if ok {
+			rowCount = count
+		} else if abs := math.Abs(corr); abs < 1 {
+			correlationFactor := math.Pow(1-abs, float64(ds.ctx.GetSessionVars().CorrelationExpFactor))
+			selectivity := ds.stats.RowCount / rowCount
+			rowCount = math.Min(prop.ExpectedCnt/selectivity/correlationFactor, rowCount)
+		}
 	}
 	is.stats = ds.tableStats.ScaleByExpectCnt(rowCount)
 	rowSize := is.indexScanRowSize(idx, ds, true)
diff --git a/planner/core/integration_test.go b/planner/core/integration_test.go
index 36b23dc105dd3..6289bf76933d8 100644
--- a/planner/core/integration_test.go
+++ b/planner/core/integration_test.go
@@ -1198,6 +1198,31 @@ func (s *testIntegrationSuite) TestTableDualWithRequiredProperty(c *C) {
 	tk.MustExec("select /*+ MERGE_JOIN(t1, t2) */ * from t1 partition (p0), t2  where t1.a > 100 and t1.a = t2.a")
 }
 
+func (s *testIntegrationSuite) TestIndexJoinInnerIndexNDV(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t1, t2")
+	tk.MustExec("create table t1(a int not null, b int not null, c int not null)")
+	tk.MustExec("create table t2(a int not null, b int not null, c int not null, index idx1(a,b), index idx2(c))")
+	tk.MustExec("insert into t1 values(1,1,1),(1,1,1),(1,1,1)")
+	tk.MustExec("insert into t2 values(1,1,1),(1,1,2),(1,1,3)")
+	tk.MustExec("analyze table t1, t2")
+
+	var input []string
+	var output []struct {
+		SQL  string
+		Plan []string
+	}
+	s.testData.GetTestCases(c, &input, &output)
+	for i, tt := range input {
+		s.testData.OnRecord(func() {
+			output[i].SQL = tt
+			output[i].Plan = s.testData.ConvertRowsToStrings(tk.MustQuery(tt).Rows())
+		})
+		tk.MustQuery(tt).Check(testkit.Rows(output[i].Plan...))
+	}
+}
+
 func (s *testIntegrationSerialSuite) TestIssue16837(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")
@@ -1525,6 +1550,28 @@ func (s *testIntegrationSerialSuite) TestExplainAnalyzePointGet(c *C) {
 	checkExplain("BatchGet")
 }
 
+func (s *testIntegrationSerialSuite) TestExplainAnalyzeDML(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec(" create table t (a int, b int, unique index (a));")
+	tk.MustExec("insert into t values (1,1)")
+
+	res := tk.MustQuery("explain analyze select * from t where a=1;")
+	checkExplain := func(rpc string) {
+		resBuff := bytes.NewBufferString("")
+		for _, row := range res.Rows() {
+			fmt.Fprintf(resBuff, "%s\n", row)
+		}
+		explain := resBuff.String()
+		c.Assert(strings.Contains(explain, rpc+":{num_rpc:"), IsTrue, Commentf("%s", explain))
+		c.Assert(strings.Contains(explain, "total_time:"), IsTrue, Commentf("%s", explain))
+	}
+	checkExplain("Get")
+	res = tk.MustQuery("explain analyze insert ignore into t values (1,1),(2,2),(3,3),(4,4);")
+	checkExplain("BatchGet")
+}
+
 func (s *testIntegrationSuite) TestPartitionExplain(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")
diff --git a/planner/core/logical_plan_builder.go b/planner/core/logical_plan_builder.go
index 0b2d79840e2f9..267a789b8bd85 100644
--- a/planner/core/logical_plan_builder.go
+++ b/planner/core/logical_plan_builder.go
@@ -113,15 +113,6 @@ const (
 	ErrExprInOrderBy = "ORDER BY"
 )
 
-func (la *LogicalAggregation) collectGroupByColumns() {
-	la.groupByCols = la.groupByCols[:0]
-	for _, item := range la.GroupByItems {
-		if col, ok := item.(*expression.Column); ok {
-			la.groupByCols = append(la.groupByCols, col)
-		}
-	}
-}
-
 // aggOrderByResolver is currently resolving expressions of order by clause
 // in aggregate function GROUP_CONCAT.
 type aggOrderByResolver struct {
@@ -260,7 +251,6 @@ func (b *PlanBuilder) buildAggregation(ctx context.Context, p LogicalPlan, aggFu
 	plan4Agg.SetChildren(p)
 	plan4Agg.GroupByItems = gbyItems
 	plan4Agg.SetSchema(schema4Agg)
-	plan4Agg.collectGroupByColumns()
 	return plan4Agg, aggIndexMap, nil
 }
 
@@ -1083,7 +1073,6 @@ func (b *PlanBuilder) buildDistinct(child LogicalPlan, length int) (*LogicalAggr
 	if hint := b.TableHints(); hint != nil {
 		plan4Agg.aggHints = hint.aggHints
 	}
-	plan4Agg.collectGroupByColumns()
 	for _, col := range child.Schema().Columns {
 		aggDesc, err := aggregation.NewAggFuncDesc(b.ctx, ast.AggFuncFirstRow, []expression.Expression{col}, false)
 		if err != nil {
@@ -2857,10 +2846,10 @@ func getStatsTable(ctx sessionctx.Context, tblInfo *model.TableInfo, pid int64)
 	}
 
 	var statsTbl *statistics.Table
-	if pid != tblInfo.ID {
-		statsTbl = statsHandle.GetPartitionStats(tblInfo, pid)
-	} else {
+	if pid == tblInfo.ID || ctx.GetSessionVars().UseDynamicPartitionPrune() {
 		statsTbl = statsHandle.GetTableStats(tblInfo)
+	} else {
+		statsTbl = statsHandle.GetPartitionStats(tblInfo, pid)
 	}
 
 	// 2. table row count from statistics is zero.
@@ -2976,7 +2965,7 @@ func (b *PlanBuilder) buildDataSource(ctx context.Context, tn *ast.TableName, as
 		columns = tbl.Cols()
 	}
 	var statisticTable *statistics.Table
-	if _, ok := tbl.(table.PartitionedTable); !ok {
+	if _, ok := tbl.(table.PartitionedTable); !ok || b.ctx.GetSessionVars().UseDynamicPartitionPrune() {
 		statisticTable = getStatsTable(b.ctx, tbl.Meta(), tbl.Meta().ID)
 	}
 
diff --git a/planner/core/logical_plan_test.go b/planner/core/logical_plan_test.go
index ce26c680af33f..704af732ea96d 100644
--- a/planner/core/logical_plan_test.go
+++ b/planner/core/logical_plan_test.go
@@ -553,6 +553,31 @@ func (s *testPlanSuite) TestColumnPruning(c *C) {
 	}
 }
 
+func (s *testPlanSuite) TestSortByItemsPruning(c *C) {
+	defer testleak.AfterTest(c)()
+	var (
+		input  []string
+		output [][]string
+	)
+	s.testData.GetTestCases(c, &input, &output)
+	s.testData.OnRecord(func() {
+		output = make([][]string, len(input))
+	})
+
+	ctx := context.Background()
+	for i, tt := range input {
+		comment := Commentf("for %s", tt)
+		stmt, err := s.ParseOneStmt(tt, "", "")
+		c.Assert(err, IsNil, comment)
+
+		p, _, err := BuildLogicalPlan(ctx, s.ctx, stmt, s.is)
+		c.Assert(err, IsNil)
+		lp, err := logicalOptimize(ctx, flagEliminateProjection|flagPredicatePushDown|flagPrunColumns|flagPrunColumnsAgain, p.(LogicalPlan))
+		c.Assert(err, IsNil)
+		s.checkOrderByItems(lp, c, &output[i], comment)
+	}
+}
+
 func (s *testPlanSuite) TestProjectionEliminator(c *C) {
 	defer testleak.AfterTest(c)()
 	tests := []struct {
@@ -620,6 +645,27 @@ func (s *testPlanSuite) checkDataSourceCols(p LogicalPlan, c *C, ans map[int][]s
 	}
 }
 
+func (s *testPlanSuite) checkOrderByItems(p LogicalPlan, c *C, colList *[]string, comment CommentInterface) {
+	switch p := p.(type) {
+	case *LogicalSort:
+		s.testData.OnRecord(func() {
+			*colList = make([]string, len(p.ByItems))
+		})
+		for i, col := range p.ByItems {
+			s.testData.OnRecord(func() {
+				(*colList)[i] = col.String()
+			})
+			s := col.String()
+			c.Assert(s, Equals, (*colList)[i], comment)
+		}
+	}
+	children := p.Children()
+	c.Assert(len(children), LessEqual, 1, Commentf("For %v Expected <= 1 Child", comment))
+	for _, child := range children {
+		s.checkOrderByItems(child, c, colList, comment)
+	}
+}
+
 func (s *testPlanSuite) TestValidate(c *C) {
 	defer testleak.AfterTest(c)()
 	tests := []struct {
diff --git a/planner/core/logical_plans.go b/planner/core/logical_plans.go
index 83e74590d6c70..9f26f1f211924 100644
--- a/planner/core/logical_plans.go
+++ b/planner/core/logical_plans.go
@@ -307,8 +307,6 @@ type LogicalAggregation struct {
 
 	AggFuncs     []*aggregation.AggFuncDesc
 	GroupByItems []expression.Expression
-	// groupByCols stores the columns that are group-by items.
-	groupByCols []*expression.Column
 
 	// aggHints stores aggregation hint information.
 	aggHints aggHintInfo
@@ -349,14 +347,16 @@ func (la *LogicalAggregation) IsCompleteModeAgg() bool {
 	return la.AggFuncs[0].Mode == aggregation.CompleteMode
 }
 
-// GetGroupByCols returns the groupByCols. If the groupByCols haven't be collected,
-// this method would collect them at first. If the GroupByItems have been changed,
-// we should explicitly collect GroupByColumns before this method.
+// GetGroupByCols returns the columns that are group-by items.
+// For example, `group by a, b, c+d` will return [a, b].
 func (la *LogicalAggregation) GetGroupByCols() []*expression.Column {
-	if la.groupByCols == nil {
-		la.collectGroupByColumns()
+	groupByCols := make([]*expression.Column, 0, len(la.GroupByItems))
+	for _, item := range la.GroupByItems {
+		if col, ok := item.(*expression.Column); ok {
+			groupByCols = append(groupByCols, col)
+		}
 	}
-	return la.groupByCols
+	return groupByCols
 }
 
 // ExtractCorrelatedCols implements LogicalPlan interface.
diff --git a/planner/core/mock.go b/planner/core/mock.go
index ba7c1145ccc38..8eee3c8647b68 100644
--- a/planner/core/mock.go
+++ b/planner/core/mock.go
@@ -14,6 +14,8 @@
 package core
 
 import (
+	"fmt"
+
 	"github.com/pingcap/parser/auth"
 	"github.com/pingcap/parser/model"
 	"github.com/pingcap/parser/mysql"
@@ -370,7 +372,9 @@ func MockContext() sessionctx.Context {
 	}
 	ctx.GetSessionVars().CurrentDB = "test"
 	do := &domain.Domain{}
-	do.CreateStatsHandle(ctx)
+	if err := do.CreateStatsHandle(ctx); err != nil {
+		panic(fmt.Sprintf("create mock context panic: %+v", err))
+	}
 	domain.BindDomain(ctx, do)
 	return ctx
 }
diff --git a/planner/core/plan_to_pb.go b/planner/core/plan_to_pb.go
index 5e6a2b948db1b..97ec3dc8dd884 100644
--- a/planner/core/plan_to_pb.go
+++ b/planner/core/plan_to_pb.go
@@ -284,7 +284,7 @@ func SetPBColumnsDefaultValue(ctx sessionctx.Context, pbColumns []*tipb.ColumnIn
 		if c.IsGenerated() && !c.GeneratedStored {
 			pbColumns[i].DefaultVal = []byte{codec.NilFlag}
 		}
-		if c.OriginDefaultValue == nil {
+		if c.GetOriginDefaultValue() == nil {
 			continue
 		}
 
diff --git a/planner/core/planbuilder.go b/planner/core/planbuilder.go
index 3b77a3daaa02f..9873208a81bd1 100644
--- a/planner/core/planbuilder.go
+++ b/planner/core/planbuilder.go
@@ -3001,6 +3001,13 @@ func (b *PlanBuilder) buildDDL(ctx context.Context, node ast.DDLNode) (Plan, err
 					v.Table.Name.L, "", authErr)
 			}
 		}
+	case *ast.AlterSequenceStmt:
+		if b.ctx.GetSessionVars().User != nil {
+			authErr = ErrTableaccessDenied.GenWithStackByArgs("ALTER", b.ctx.GetSessionVars().User.AuthUsername,
+				b.ctx.GetSessionVars().User.AuthHostname, v.Name.Name.L)
+		}
+		b.visitInfo = appendVisitInfo(b.visitInfo, mysql.AlterPriv, v.Name.Schema.L,
+			v.Name.Name.L, "", authErr)
 	case *ast.CreateDatabaseStmt:
 		if b.ctx.GetSessionVars().User != nil {
 			authErr = ErrDBaccessDenied.GenWithStackByArgs(b.ctx.GetSessionVars().User.AuthUsername,
diff --git a/planner/core/point_get_plan_test.go b/planner/core/point_get_plan_test.go
index fa89750f81ffc..05a8c9890cbfc 100644
--- a/planner/core/point_get_plan_test.go
+++ b/planner/core/point_get_plan_test.go
@@ -91,7 +91,7 @@ func (s *testPointGetSuite) TestPointGetPlanCache(c *C) {
 		"└─Point_Get_1 1.00 root table:t handle:1",
 	))
 	tk.MustQuery("explain select a from t where a = -1").Check(testkit.Rows(
-		"TableDual_5 0.00 root  rows:0",
+		"TableDual_6 0.00 root  rows:0",
 	))
 	tk.MustExec(`prepare stmt0 from "select a from t where a = ?"`)
 	tk.MustExec("set @p0 = -1")
diff --git a/planner/core/preprocess.go b/planner/core/preprocess.go
index a8b4d1d47a5b1..eb5cbad22d13e 100644
--- a/planner/core/preprocess.go
+++ b/planner/core/preprocess.go
@@ -188,6 +188,11 @@ func (p *preprocessor) Enter(in ast.Node) (out ast.Node, skipChildren bool) {
 		if node.Kind == ast.BRIEKindRestore {
 			p.flag |= inCreateOrDropTable
 		}
+	case *ast.TableSource:
+		isModeOracle := p.ctx.GetSessionVars().SQLMode&mysql.ModeOracle != 0
+		if _, ok := node.Source.(*ast.SelectStmt); ok && !isModeOracle && len(node.AsName.L) == 0 {
+			p.err = ddl.ErrDerivedMustHaveAlias.GenWithStackByArgs()
+		}
 	case *ast.CreateStatisticsStmt, *ast.DropStatisticsStmt:
 		p.checkStatisticsOpGrammar(in)
 	default:
@@ -580,13 +585,16 @@ func (p *preprocessor) checkNonUniqTableAlias(stmt *ast.Join) {
 		p.tableAliasInJoin = append(p.tableAliasInJoin, make(map[string]interface{}))
 	}
 	tableAliases := p.tableAliasInJoin[len(p.tableAliasInJoin)-1]
-	if err := isTableAliasDuplicate(stmt.Left, tableAliases); err != nil {
-		p.err = err
-		return
-	}
-	if err := isTableAliasDuplicate(stmt.Right, tableAliases); err != nil {
-		p.err = err
-		return
+	isOracleMode := p.ctx.GetSessionVars().SQLMode&mysql.ModeOracle != 0
+	if !isOracleMode {
+		if err := isTableAliasDuplicate(stmt.Left, tableAliases); err != nil {
+			p.err = err
+			return
+		}
+		if err := isTableAliasDuplicate(stmt.Right, tableAliases); err != nil {
+			p.err = err
+			return
+		}
 	}
 	p.flag |= parentIsJoin
 }
diff --git a/planner/core/property_cols_prune.go b/planner/core/property_cols_prune.go
index a57a06993893e..c8296aa799283 100644
--- a/planner/core/property_cols_prune.go
+++ b/planner/core/property_cols_prune.go
@@ -200,10 +200,11 @@ func (la *LogicalAggregation) PreparePossibleProperties(schema *expression.Schem
 		return nil
 	}
 	resultProperties := make([][]*expression.Column, 0, len(childProps))
+	groupByCols := la.GetGroupByCols()
 	for _, possibleChildProperty := range childProps {
-		sortColOffsets := getMaxSortPrefix(possibleChildProperty, la.groupByCols)
-		if len(sortColOffsets) == len(la.groupByCols) {
-			resultProperties = append(resultProperties, possibleChildProperty[:len(la.groupByCols)])
+		sortColOffsets := getMaxSortPrefix(possibleChildProperty, groupByCols)
+		if len(sortColOffsets) == len(groupByCols) {
+			resultProperties = append(resultProperties, possibleChildProperty[:len(groupByCols)])
 		}
 	}
 	la.possibleProperties = resultProperties
diff --git a/planner/core/rule_aggregation_elimination.go b/planner/core/rule_aggregation_elimination.go
index 7af0511c12864..143649b1f1271 100644
--- a/planner/core/rule_aggregation_elimination.go
+++ b/planner/core/rule_aggregation_elimination.go
@@ -51,7 +51,7 @@ func (a *aggregationEliminateChecker) tryToEliminateAggregation(agg *LogicalAggr
 			return nil
 		}
 	}
-	schemaByGroupby := expression.NewSchema(agg.groupByCols...)
+	schemaByGroupby := expression.NewSchema(agg.GetGroupByCols()...)
 	coveredByUniqueKey := false
 	for _, key := range agg.children[0].Schema().Keys {
 		if schemaByGroupby.ColumnsIndices(key) != nil {
diff --git a/planner/core/rule_aggregation_push_down.go b/planner/core/rule_aggregation_push_down.go
index 0c796e4b0c3f4..0eba09a777fca 100644
--- a/planner/core/rule_aggregation_push_down.go
+++ b/planner/core/rule_aggregation_push_down.go
@@ -269,7 +269,6 @@ func (a *aggregationPushDownSolver) checkAnyCountAndSum(aggFuncs []*aggregation.
 func (a *aggregationPushDownSolver) makeNewAgg(ctx sessionctx.Context, aggFuncs []*aggregation.AggFuncDesc, gbyCols []*expression.Column, aggHints aggHintInfo, blockOffset int) (*LogicalAggregation, error) {
 	agg := LogicalAggregation{
 		GroupByItems: expression.Column2Exprs(gbyCols),
-		groupByCols:  gbyCols,
 		aggHints:     aggHints,
 	}.Init(ctx, blockOffset)
 	aggLen := len(aggFuncs) + len(gbyCols)
@@ -306,7 +305,6 @@ func (a *aggregationPushDownSolver) splitPartialAgg(agg *LogicalAggregation) (pu
 	agg.SetSchema(final.Schema)
 	agg.AggFuncs = final.AggFuncs
 	agg.GroupByItems = final.GroupByItems
-	agg.collectGroupByColumns()
 
 	pushedAgg = LogicalAggregation{
 		AggFuncs:     partial.AggFuncs,
@@ -314,7 +312,6 @@ func (a *aggregationPushDownSolver) splitPartialAgg(agg *LogicalAggregation) (pu
 		aggHints:     agg.aggHints,
 	}.Init(agg.ctx, agg.blockOffset)
 	pushedAgg.SetSchema(partial.Schema)
-	pushedAgg.collectGroupByColumns()
 	return
 }
 
@@ -347,8 +344,7 @@ func (a *aggregationPushDownSolver) pushAggCrossUnion(agg *LogicalAggregation, u
 		}
 		newAgg.AggFuncs = append(newAgg.AggFuncs, firstRow)
 	}
-	newAgg.collectGroupByColumns()
-	tmpSchema := expression.NewSchema(newAgg.groupByCols...)
+	tmpSchema := expression.NewSchema(newAgg.GetGroupByCols()...)
 	// e.g. Union distinct will add a aggregation like `select join_agg_0, join_agg_1, join_agg_2 from t group by a, b, c` above UnionAll.
 	// And the pushed agg will be something like `select a, b, c, a, b, c from t group by a, b, c`. So if we just return child as join does,
 	// this will cause error during executor phase.
@@ -434,7 +430,6 @@ func (a *aggregationPushDownSolver) aggPushDown(p LogicalPlan) (_ LogicalPlan, e
 				for i, gbyItem := range agg.GroupByItems {
 					agg.GroupByItems[i] = expression.ColumnSubstitute(gbyItem, proj.schema, proj.Exprs)
 				}
-				agg.collectGroupByColumns()
 				for _, aggFunc := range agg.AggFuncs {
 					newArgs := make([]expression.Expression, 0, len(aggFunc.Args))
 					for _, arg := range aggFunc.Args {
diff --git a/planner/core/rule_build_key_info.go b/planner/core/rule_build_key_info.go
index 11c4e41aa24fa..4e32e518367a2 100644
--- a/planner/core/rule_build_key_info.go
+++ b/planner/core/rule_build_key_info.go
@@ -58,8 +58,9 @@ func (la *LogicalAggregation) BuildKeyInfo(selfSchema *expression.Schema, childS
 		}
 		selfSchema.Keys = append(selfSchema.Keys, newKey)
 	}
-	if len(la.groupByCols) == len(la.GroupByItems) && len(la.GroupByItems) > 0 {
-		indices := selfSchema.ColumnsIndices(la.groupByCols)
+	groupByCols := la.GetGroupByCols()
+	if len(groupByCols) == len(la.GroupByItems) && len(la.GroupByItems) > 0 {
+		indices := selfSchema.ColumnsIndices(groupByCols)
 		if indices != nil {
 			newKey := make([]*expression.Column, 0, len(indices))
 			for _, i := range indices {
diff --git a/planner/core/rule_column_pruning.go b/planner/core/rule_column_pruning.go
index 12125040939f0..d482e41724e0b 100644
--- a/planner/core/rule_column_pruning.go
+++ b/planner/core/rule_column_pruning.go
@@ -137,9 +137,15 @@ func (la *LogicalAggregation) PruneColumns(parentUsedCols []*expression.Column)
 
 func pruneByItems(old []*util.ByItems) (new []*util.ByItems, parentUsedCols []*expression.Column) {
 	new = make([]*util.ByItems, 0, len(old))
+	seen := make(map[string]struct{}, len(old))
 	for _, byItem := range old {
+		hash := string(byItem.Expr.HashCode(nil))
+		_, hashMatch := seen[hash]
+		seen[hash] = struct{}{}
 		cols := expression.ExtractColumns(byItem.Expr)
-		if len(cols) == 0 {
+		if hashMatch {
+			// do nothing, should be filtered
+		} else if len(cols) == 0 {
 			if !expression.IsRuntimeConstExpr(byItem.Expr) {
 				new = append(new, byItem)
 			}
diff --git a/planner/core/rule_decorrelate.go b/planner/core/rule_decorrelate.go
index 956d651f660ff..ad28f66be5053 100644
--- a/planner/core/rule_decorrelate.go
+++ b/planner/core/rule_decorrelate.go
@@ -205,7 +205,6 @@ func (s *decorrelateSolver) optimize(ctx context.Context, p LogicalPlan) (Logica
 				agg.SetChildren(np)
 				// TODO: Add a Projection if any argument of aggregate funcs or group by items are scalar functions.
 				// agg.buildProjectionIfNecessary()
-				agg.collectGroupByColumns()
 				return agg, nil
 			}
 			// We can pull up the equal conditions below the aggregation as the join key of the apply, if only
@@ -228,7 +227,7 @@ func (s *decorrelateSolver) optimize(ctx context.Context, p LogicalPlan) (Logica
 					sel.Conditions = remainedExpr
 					apply.CorCols = extractCorColumnsBySchema4LogicalPlan(apply.children[1], apply.children[0].Schema())
 					// There's no other correlated column.
-					groupByCols := expression.NewSchema(agg.groupByCols...)
+					groupByCols := expression.NewSchema(agg.GetGroupByCols()...)
 					if len(apply.CorCols) == 0 {
 						join := &apply.LogicalJoin
 						join.EqualConditions = append(join.EqualConditions, eqCondWithCorCol...)
@@ -250,7 +249,6 @@ func (s *decorrelateSolver) optimize(ctx context.Context, p LogicalPlan) (Logica
 								groupByCols.Append(clonedCol)
 							}
 						}
-						agg.collectGroupByColumns()
 						// The selection may be useless, check and remove it.
 						if len(sel.Conditions) == 0 {
 							agg.SetChildren(sel.children[0])
diff --git a/planner/core/rule_eliminate_projection.go b/planner/core/rule_eliminate_projection.go
index 404c5e01dd77c..19326a7cb3ed4 100644
--- a/planner/core/rule_eliminate_projection.go
+++ b/planner/core/rule_eliminate_projection.go
@@ -206,7 +206,6 @@ func (la *LogicalAggregation) replaceExprColumns(replace map[string]*expression.
 	for _, gbyItem := range la.GroupByItems {
 		ResolveExprAndReplace(gbyItem, replace)
 	}
-	la.collectGroupByColumns()
 }
 
 func (p *LogicalSelection) replaceExprColumns(replace map[string]*expression.Column) {
diff --git a/planner/core/rule_partition_processor.go b/planner/core/rule_partition_processor.go
index 6b329358290f9..26bbc9f87a3cd 100644
--- a/planner/core/rule_partition_processor.go
+++ b/planner/core/rule_partition_processor.go
@@ -946,7 +946,9 @@ func (s *partitionProcessor) makeUnionAllChildren(ds *DataSource, pi *model.Part
 			// id as FromID. So we set the id of the newDataSource with the original one to
 			// avoid traversing the whole plan tree to update the references.
 			newDataSource.id = ds.id
-			newDataSource.statisticTable = getStatsTable(ds.SCtx(), ds.table.Meta(), pi.Definitions[i].ID)
+			if !ds.ctx.GetSessionVars().UseDynamicPartitionPrune() {
+				newDataSource.statisticTable = getStatsTable(ds.SCtx(), ds.table.Meta(), pi.Definitions[i].ID)
+			}
 			err := s.resolveOptimizeHint(&newDataSource, pi.Definitions[i].Name)
 			partitionNameSet.Insert(pi.Definitions[i].Name.L)
 			if err != nil {
diff --git a/planner/core/rule_predicate_push_down.go b/planner/core/rule_predicate_push_down.go
index 417375bf31a4b..e3d0195c1b1a7 100644
--- a/planner/core/rule_predicate_push_down.go
+++ b/planner/core/rule_predicate_push_down.go
@@ -395,7 +395,7 @@ func (la *LogicalAggregation) PredicatePushDown(predicates []expression.Expressi
 	for _, fun := range la.AggFuncs {
 		exprsOriginal = append(exprsOriginal, fun.Args[0])
 	}
-	groupByColumns := expression.NewSchema(la.groupByCols...)
+	groupByColumns := expression.NewSchema(la.GetGroupByCols()...)
 	for _, cond := range predicates {
 		switch cond.(type) {
 		case *expression.Constant:
diff --git a/planner/core/testdata/analyzeSuiteTestLimitIndexEstimationT.json b/planner/core/testdata/analyzeSuiteTestLimitIndexEstimationT.json
new file mode 100644
index 0000000000000..1ea31af5f7629
--- /dev/null
+++ b/planner/core/testdata/analyzeSuiteTestLimitIndexEstimationT.json
@@ -0,0 +1,46522 @@
+{
+ "database_name": "test",
+ "table_name": "t",
+ "columns": {
+  "a": {
+   "histogram": {
+    "ndv": 1000000,
+    "buckets": [
+     {
+      "count": 3998,
+      "lower_bound": "MTQwMw==",
+      "upper_bound": "MzY0MQ==",
+      "repeats": 1
+     },
+     {
+      "count": 7996,
+      "lower_bound": "MzgxNg==",
+      "upper_bound": "NjUyOQ==",
+      "repeats": 1
+     },
+     {
+      "count": 11994,
+      "lower_bound": "NjgyMw==",
+      "upper_bound": "MTE5MTk=",
+      "repeats": 1
+     },
+     {
+      "count": 15992,
+      "lower_bound": "MTIzNTE=",
+      "upper_bound": "MTc4NjI=",
+      "repeats": 1
+     },
+     {
+      "count": 19990,
+      "lower_bound": "MTgxNTE=",
+      "upper_bound": "MjUxNjI=",
+      "repeats": 1
+     },
+     {
+      "count": 23988,
+      "lower_bound": "MjY3NDU=",
+      "upper_bound": "Mjk2MzE=",
+      "repeats": 1
+     },
+     {
+      "count": 27986,
+      "lower_bound": "MzAzNzA=",
+      "upper_bound": "MzI3Njc=",
+      "repeats": 1
+     },
+     {
+      "count": 31984,
+      "lower_bound": "MzM0NjY=",
+      "upper_bound": "Mzg0MjE=",
+      "repeats": 1
+     },
+     {
+      "count": 35982,
+      "lower_bound": "Mzk0NzI=",
+      "upper_bound": "NDI0MzQ=",
+      "repeats": 1
+     },
+     {
+      "count": 39980,
+      "lower_bound": "NDI0Njk=",
+      "upper_bound": "NDQ3NDI=",
+      "repeats": 1
+     },
+     {
+      "count": 43978,
+      "lower_bound": "NDgyODA=",
+      "upper_bound": "NTIyMjk=",
+      "repeats": 1
+     },
+     {
+      "count": 47976,
+      "lower_bound": "NTIzNTM=",
+      "upper_bound": "NTcwNjQ=",
+      "repeats": 1
+     },
+     {
+      "count": 51974,
+      "lower_bound": "NTcxMzc=",
+      "upper_bound": "NjA5ODQ=",
+      "repeats": 1
+     },
+     {
+      "count": 55972,
+      "lower_bound": "NjEyODI=",
+      "upper_bound": "NjU1MTk=",
+      "repeats": 1
+     },
+     {
+      "count": 59970,
+      "lower_bound": "NjU2MzA=",
+      "upper_bound": "Njg2ODI=",
+      "repeats": 1
+     },
+     {
+      "count": 63968,
+      "lower_bound": "NjkyMDg=",
+      "upper_bound": "NzczMDA=",
+      "repeats": 1
+     },
+     {
+      "count": 67966,
+      "lower_bound": "NzgyMTc=",
+      "upper_bound": "ODMyODc=",
+      "repeats": 1
+     },
+     {
+      "count": 71964,
+      "lower_bound": "ODM4NjM=",
+      "upper_bound": "ODgyODQ=",
+      "repeats": 1
+     },
+     {
+      "count": 75962,
+      "lower_bound": "ODg3NDc=",
+      "upper_bound": "OTE1MTQ=",
+      "repeats": 1
+     },
+     {
+      "count": 79960,
+      "lower_bound": "OTE5NDk=",
+      "upper_bound": "OTc0MjY=",
+      "repeats": 1
+     },
+     {
+      "count": 83958,
+      "lower_bound": "OTc1NTA=",
+      "upper_bound": "MTAyMjU2",
+      "repeats": 1
+     },
+     {
+      "count": 87956,
+      "lower_bound": "MTAzODAy",
+      "upper_bound": "MTA4ODM5",
+      "repeats": 1
+     },
+     {
+      "count": 91954,
+      "lower_bound": "MTA5NDA0",
+      "upper_bound": "MTExODEy",
+      "repeats": 1
+     },
+     {
+      "count": 95952,
+      "lower_bound": "MTEyMjEw",
+      "upper_bound": "MTE4NTEx",
+      "repeats": 1
+     },
+     {
+      "count": 99950,
+      "lower_bound": "MTE5MDE2",
+      "upper_bound": "MTI0MjQw",
+      "repeats": 1
+     },
+     {
+      "count": 103948,
+      "lower_bound": "MTI0ODk1",
+      "upper_bound": "MTMwNDM0",
+      "repeats": 1
+     },
+     {
+      "count": 107946,
+      "lower_bound": "MTMwODU1",
+      "upper_bound": "MTMzODI1",
+      "repeats": 1
+     },
+     {
+      "count": 111944,
+      "lower_bound": "MTM1NDkz",
+      "upper_bound": "MTM3MzA3",
+      "repeats": 1
+     },
+     {
+      "count": 115942,
+      "lower_bound": "MTM4MjQ3",
+      "upper_bound": "MTM5Njk3",
+      "repeats": 1
+     },
+     {
+      "count": 119940,
+      "lower_bound": "MTQwMzQ2",
+      "upper_bound": "MTQyMTg4",
+      "repeats": 1
+     },
+     {
+      "count": 123938,
+      "lower_bound": "MTQyNzgy",
+      "upper_bound": "MTQ1NDIz",
+      "repeats": 1
+     },
+     {
+      "count": 127936,
+      "lower_bound": "MTQ2NjQ4",
+      "upper_bound": "MTUxMDk5",
+      "repeats": 1
+     },
+     {
+      "count": 131934,
+      "lower_bound": "MTUxNTM1",
+      "upper_bound": "MTU2MzI5",
+      "repeats": 1
+     },
+     {
+      "count": 135932,
+      "lower_bound": "MTU2NDI0",
+      "upper_bound": "MTY0MTMx",
+      "repeats": 1
+     },
+     {
+      "count": 139930,
+      "lower_bound": "MTY1NDE2",
+      "upper_bound": "MTY3NTY3",
+      "repeats": 1
+     },
+     {
+      "count": 143928,
+      "lower_bound": "MTY4Mzcw",
+      "upper_bound": "MTcyNzQz",
+      "repeats": 1
+     },
+     {
+      "count": 147926,
+      "lower_bound": "MTczMDU3",
+      "upper_bound": "MTc2MzI3",
+      "repeats": 1
+     },
+     {
+      "count": 151924,
+      "lower_bound": "MTc2MzYz",
+      "upper_bound": "MTgzMDIz",
+      "repeats": 1
+     },
+     {
+      "count": 155922,
+      "lower_bound": "MTgzNTI1",
+      "upper_bound": "MTkwMTg2",
+      "repeats": 1
+     },
+     {
+      "count": 159920,
+      "lower_bound": "MTkwNzQx",
+      "upper_bound": "MTk1MDcz",
+      "repeats": 1
+     },
+     {
+      "count": 163918,
+      "lower_bound": "MTk1MjQ5",
+      "upper_bound": "MTk4Mzk4",
+      "repeats": 1
+     },
+     {
+      "count": 167916,
+      "lower_bound": "MTk4NjQx",
+      "upper_bound": "MjA2OTYz",
+      "repeats": 1
+     },
+     {
+      "count": 171914,
+      "lower_bound": "MjA3MTM5",
+      "upper_bound": "MjEwNzg0",
+      "repeats": 1
+     },
+     {
+      "count": 175912,
+      "lower_bound": "MjExMzky",
+      "upper_bound": "MjE3OTk5",
+      "repeats": 1
+     },
+     {
+      "count": 179910,
+      "lower_bound": "MjE4MTU2",
+      "upper_bound": "MjI2Mzkw",
+      "repeats": 1
+     },
+     {
+      "count": 183908,
+      "lower_bound": "MjI3NDU2",
+      "upper_bound": "MjMwNDI1",
+      "repeats": 1
+     },
+     {
+      "count": 187906,
+      "lower_bound": "MjMwNDM4",
+      "upper_bound": "MjM0NjMy",
+      "repeats": 1
+     },
+     {
+      "count": 191904,
+      "lower_bound": "MjM1NjIw",
+      "upper_bound": "MjQxMDk3",
+      "repeats": 1
+     },
+     {
+      "count": 195902,
+      "lower_bound": "MjQxMTAy",
+      "upper_bound": "MjQ0MjYy",
+      "repeats": 1
+     },
+     {
+      "count": 199900,
+      "lower_bound": "MjQ1Njgx",
+      "upper_bound": "MjUzNTY1",
+      "repeats": 1
+     },
+     {
+      "count": 203898,
+      "lower_bound": "MjU0NTg4",
+      "upper_bound": "MjU5NzQx",
+      "repeats": 1
+     },
+     {
+      "count": 207896,
+      "lower_bound": "MjYwNTM3",
+      "upper_bound": "MjYzNzY4",
+      "repeats": 1
+     },
+     {
+      "count": 211894,
+      "lower_bound": "MjY0MDU5",
+      "upper_bound": "MjY5Mzk0",
+      "repeats": 1
+     },
+     {
+      "count": 215892,
+      "lower_bound": "MjY5NDU4",
+      "upper_bound": "MjczODc1",
+      "repeats": 1
+     },
+     {
+      "count": 219890,
+      "lower_bound": "MjczODk4",
+      "upper_bound": "MjgwNDk4",
+      "repeats": 1
+     },
+     {
+      "count": 223888,
+      "lower_bound": "MjgwNTg3",
+      "upper_bound": "Mjg2MDE3",
+      "repeats": 1
+     },
+     {
+      "count": 227886,
+      "lower_bound": "Mjg4ODI1",
+      "upper_bound": "MjkzNzIw",
+      "repeats": 1
+     },
+     {
+      "count": 231884,
+      "lower_bound": "Mjk0NjAz",
+      "upper_bound": "Mjk3Nzg3",
+      "repeats": 1
+     },
+     {
+      "count": 235882,
+      "lower_bound": "Mjk4Mjgz",
+      "upper_bound": "MzAzMzQ2",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzA0OTcy",
+      "upper_bound": "MzA4OTgy",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzA5NDky",
+      "upper_bound": "MzE1MjA4",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzE2MjQx",
+      "upper_bound": "MzE5MDYz",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzE5MTgy",
+      "upper_bound": "MzIxODcz",
+      "repeats": 1
+     },
+     {
+      "count": 255872,
+      "lower_bound": "MzIyODQ5",
+      "upper_bound": "MzI1NjQw",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzI1OTQ2",
+      "upper_bound": "MzMxMTY3",
+      "repeats": 1
+     },
+     {
+      "count": 263868,
+      "lower_bound": "MzMxODU1",
+      "upper_bound": "MzM1NTMw",
+      "repeats": 1
+     },
+     {
+      "count": 267866,
+      "lower_bound": "MzM2Mjg1",
+      "upper_bound": "MzQyMzE3",
+      "repeats": 1
+     },
+     {
+      "count": 271864,
+      "lower_bound": "MzQyNjAw",
+      "upper_bound": "MzQ3MjU2",
+      "repeats": 1
+     },
+     {
+      "count": 275862,
+      "lower_bound": "MzQ4MTIw",
+      "upper_bound": "MzUxMjg4",
+      "repeats": 1
+     },
+     {
+      "count": 279860,
+      "lower_bound": "MzUzODc1",
+      "upper_bound": "MzU3NjI2",
+      "repeats": 1
+     },
+     {
+      "count": 283858,
+      "lower_bound": "MzU3NzAx",
+      "upper_bound": "MzYyMjIy",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzYzNDgy",
+      "upper_bound": "MzcwNzQx",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzcxMDk3",
+      "upper_bound": "Mzc0ODky",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "Mzc1NDkw",
+      "upper_bound": "MzgwMzU3",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzgxNDQ1",
+      "upper_bound": "Mzg0ODA0",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "Mzg0ODYw",
+      "upper_bound": "Mzg5NDQz",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "MzkwNDUw",
+      "upper_bound": "Mzk1MTU5",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "Mzk2Nzgz",
+      "upper_bound": "NDAwNDUy",
+      "repeats": 1
+     },
+     {
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+      "lower_bound": "NDAwNTIz",
+      "upper_bound": "NDAzNDc1",
+      "repeats": 1
+     },
+     {
+      "count": 319840,
+      "lower_bound": "NDAzOTQz",
+      "upper_bound": "NDEwNDg0",
+      "repeats": 1
+     },
+     {
+      "count": 323838,
+      "lower_bound": "NDEwODY0",
+      "upper_bound": "NDE1NDUy",
+      "repeats": 1
+     },
+     {
+      "count": 327836,
+      "lower_bound": "NDE2MTQ4",
+      "upper_bound": "NDE4MDkx",
+      "repeats": 1
+     },
+     {
+      "count": 331834,
+      "lower_bound": "NDE4MTM3",
+      "upper_bound": "NDI0NzIz",
+      "repeats": 1
+     },
+     {
+      "count": 335832,
+      "lower_bound": "NDI0NzI0",
+      "upper_bound": "NDI4OTAy",
+      "repeats": 1
+     },
+     {
+      "count": 339830,
+      "lower_bound": "NDI5MzE3",
+      "upper_bound": "NDMzNjI3",
+      "repeats": 1
+     },
+     {
+      "count": 343828,
+      "lower_bound": "NDMzODM4",
+      "upper_bound": "NDM3MjMz",
+      "repeats": 1
+     },
+     {
+      "count": 347826,
+      "lower_bound": "NDM4MDIz",
+      "upper_bound": "NDQyMzcz",
+      "repeats": 1
+     },
+     {
+      "count": 351824,
+      "lower_bound": "NDQzMzA1",
+      "upper_bound": "NDQ3Mzcx",
+      "repeats": 1
+     },
+     {
+      "count": 355822,
+      "lower_bound": "NDQ4MzM3",
+      "upper_bound": "NDUyODk0",
+      "repeats": 1
+     },
+     {
+      "count": 359820,
+      "lower_bound": "NDUzMzY4",
+      "upper_bound": "NDU2MTI4",
+      "repeats": 1
+     },
+     {
+      "count": 363818,
+      "lower_bound": "NDU2MzU5",
+      "upper_bound": "NDYwNzkz",
+      "repeats": 1
+     },
+     {
+      "count": 367816,
+      "lower_bound": "NDYxMzIx",
+      "upper_bound": "NDcxOTM4",
+      "repeats": 1
+     },
+     {
+      "count": 371814,
+      "lower_bound": "NDcyMjMz",
+      "upper_bound": "NDc5MDA3",
+      "repeats": 1
+     },
+     {
+      "count": 375812,
+      "lower_bound": "NDc5NDg1",
+      "upper_bound": "NDgyMTIx",
+      "repeats": 1
+     },
+     {
+      "count": 379810,
+      "lower_bound": "NDgzMjM1",
+      "upper_bound": "NDg2MTY1",
+      "repeats": 1
+     },
+     {
+      "count": 383808,
+      "lower_bound": "NDg4MjM2",
+      "upper_bound": "NDkxMTky",
+      "repeats": 1
+     },
+     {
+      "count": 387806,
+      "lower_bound": "NDkyNDA0",
+      "upper_bound": "NDk2OTA1",
+      "repeats": 1
+     },
+     {
+      "count": 391804,
+      "lower_bound": "NDk3ODY2",
+      "upper_bound": "NTAyNzk4",
+      "repeats": 1
+     },
+     {
+      "count": 395802,
+      "lower_bound": "NTAzODI1",
+      "upper_bound": "NTA2NTc0",
+      "repeats": 1
+     },
+     {
+      "count": 399800,
+      "lower_bound": "NTA2OTQw",
+      "upper_bound": "NTA5ODA1",
+      "repeats": 1
+     },
+     {
+      "count": 403798,
+      "lower_bound": "NTA5ODQx",
+      "upper_bound": "NTE2OTU3",
+      "repeats": 1
+     },
+     {
+      "count": 407796,
+      "lower_bound": "NTE3NTM3",
+      "upper_bound": "NTIwMTIz",
+      "repeats": 1
+     },
+     {
+      "count": 411794,
+      "lower_bound": "NTIwMjQ5",
+      "upper_bound": "NTI0Mzk4",
+      "repeats": 1
+     },
+     {
+      "count": 415792,
+      "lower_bound": "NTI2MTEy",
+      "upper_bound": "NTMyOTU0",
+      "repeats": 1
+     },
+     {
+      "count": 419790,
+      "lower_bound": "NTMzNjk1",
+      "upper_bound": "NTM2ODQ4",
+      "repeats": 1
+     },
+     {
+      "count": 423788,
+      "lower_bound": "NTM2OTEz",
+      "upper_bound": "NTQyMzU1",
+      "repeats": 1
+     },
+     {
+      "count": 427786,
+      "lower_bound": "NTQyNTQ2",
+      "upper_bound": "NTQ2ODE3",
+      "repeats": 1
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+       502,
+       456,
+       496,
+       488,
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+       469,
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+       521,
+       472,
+       523,
+       495,
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+       498,
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+       495,
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+       430,
+       501,
+       485,
+       474,
+       517,
+       509,
+       491,
+       484,
+       468,
+       505
+      ]
+     }
+    ],
+    "default_value": 0
+   },
+   "null_count": 0,
+   "tot_col_size": 0,
+   "last_update_version": 417600050823954432,
+   "correlation": 0
+  }
+ },
+ "ext_stats": [
+  {
+   "stats_name": "stats1",
+   "db": "test",
+   "cols": [
+    1,
+    2
+   ],
+   "type": 2,
+   "scalar_vals": -1,
+   "string_vals": ""
+  }
+ ],
+ "count": 1000000,
+ "modify_count": 0,
+ "partitions": null
+}
\ No newline at end of file
diff --git a/planner/core/testdata/analyze_suite_in.json b/planner/core/testdata/analyze_suite_in.json
index 1187de96f090e..8d2e32ddb7401 100644
--- a/planner/core/testdata/analyze_suite_in.json
+++ b/planner/core/testdata/analyze_suite_in.json
@@ -193,5 +193,14 @@
       // Should choose `primary` index instead of index `b`.
       "explain select c, b from t where a = 7639902 order by b asc limit 6"
     ]
+  },
+  {
+    "name": "TestLimitIndexEstimation",
+    "cases": [
+      // Should choose idx_a instead of idx_b, because idx_b would scan 990001 rows.
+      "explain select * from t where a <= 10000 order by b limit 1",
+      // Should choose idx_b instead of idx_a, because idx_b would scan only 1 row.
+      "explain select * from t where a >= 999900 order by b limit 1"
+    ]
   }
 ]
diff --git a/planner/core/testdata/analyze_suite_out.json b/planner/core/testdata/analyze_suite_out.json
index 8d42349bb20fc..e7d6df463ef1c 100644
--- a/planner/core/testdata/analyze_suite_out.json
+++ b/planner/core/testdata/analyze_suite_out.json
@@ -378,5 +378,31 @@
         ]
       }
     ]
+  },
+  {
+    "Name": "TestLimitIndexEstimation",
+    "Cases": [
+      {
+        "SQL": "explain select * from t where a <= 10000 order by b limit 1",
+        "Plan": [
+          "TopN_9 1.00 root  test.t.b, offset:0, count:1",
+          "└─IndexLookUp_21 1.00 root  ",
+          "  ├─IndexRangeScan_18(Build) 10000.00 cop[tikv] table:t, index:idx_a(a) range:[-inf,10000], keep order:false",
+          "  └─TopN_20(Probe) 1.00 cop[tikv]  test.t.b, offset:0, count:1",
+          "    └─TableRowIDScan_19 10000.00 cop[tikv] table:t keep order:false"
+        ]
+      },
+      {
+        "SQL": "explain select * from t where a >= 999900 order by b limit 1",
+        "Plan": [
+          "Limit_12 1.00 root  offset:0, count:1",
+          "└─Projection_32 1.00 root  test.t.a, test.t.b",
+          "  └─IndexLookUp_31 1.00 root  ",
+          "    ├─IndexFullScan_28(Build) 1.00 cop[tikv] table:t, index:idx_b(b) keep order:true",
+          "    └─Selection_30(Probe) 1.00 cop[tikv]  ge(test.t.a, 999900)",
+          "      └─TableRowIDScan_29 1.00 cop[tikv] table:t keep order:false"
+        ]
+      }
+    ]
   }
 ]
diff --git a/planner/core/testdata/integration_suite_in.json b/planner/core/testdata/integration_suite_in.json
index 62930182da16d..2417855ee0660 100644
--- a/planner/core/testdata/integration_suite_in.json
+++ b/planner/core/testdata/integration_suite_in.json
@@ -19,6 +19,13 @@
       "explain select * from t t1 left join t t2 on t1.a=t2.a where from_unixtime(t2.b);"
     ]
   },
+  {
+    "name": "TestIndexJoinInnerIndexNDV",
+    "cases": [
+      // t2 should use idx2 instead of idx1, since idx2 has larger NDV.
+      "explain select /*+ inl_join(t2) */ * from t1, t2 where t1.a = t2.a and t1.b = t2.b and t1.c = t2.c"
+    ]
+  },
   {
     "name": "TestSimplifyOuterJoinWithCast",
     "cases": [
diff --git a/planner/core/testdata/integration_suite_out.json b/planner/core/testdata/integration_suite_out.json
index fcbd1959212e1..245f8f991f385 100644
--- a/planner/core/testdata/integration_suite_out.json
+++ b/planner/core/testdata/integration_suite_out.json
@@ -62,6 +62,22 @@
       }
     ]
   },
+  {
+    "Name": "TestIndexJoinInnerIndexNDV",
+    "Cases": [
+      {
+        "SQL": "explain select /*+ inl_join(t2) */ * from t1, t2 where t1.a = t2.a and t1.b = t2.b and t1.c = t2.c",
+        "Plan": [
+          "IndexJoin_10 3.00 root  inner join, inner:IndexLookUp_9, outer key:test.t1.c, inner key:test.t2.c, other cond:eq(test.t1.a, test.t2.a), eq(test.t1.b, test.t2.b)",
+          "├─TableReader_20(Build) 3.00 root  data:TableFullScan_19",
+          "│ └─TableFullScan_19 3.00 cop[tikv] table:t1 keep order:false",
+          "└─IndexLookUp_9(Probe) 1.00 root  ",
+          "  ├─IndexRangeScan_7(Build) 1.00 cop[tikv] table:t2, index:idx2(c) range: decided by [eq(test.t2.c, test.t1.c)], keep order:false",
+          "  └─TableRowIDScan_8(Probe) 1.00 cop[tikv] table:t2 keep order:false"
+        ]
+      }
+    ]
+  },
   {
     "Name": "TestSimplifyOuterJoinWithCast",
     "Cases": [
diff --git a/planner/core/testdata/plan_suite_out.json b/planner/core/testdata/plan_suite_out.json
index acf3a9c160267..4fba9a92251d2 100644
--- a/planner/core/testdata/plan_suite_out.json
+++ b/planner/core/testdata/plan_suite_out.json
@@ -879,7 +879,7 @@
     "Cases": [
       {
         "SQL": "select a from t where c is not null",
-        "Best": "IndexReader(Index(t.c_d_e)[[-inf,+inf]])->Projection"
+        "Best": "IndexReader(Index(t.f)[[NULL,+inf]])"
       },
       {
         "SQL": "select a from t where c >= 4",
@@ -1225,17 +1225,17 @@
       },
       {
         "SQL": "select /*+ HASH_AGG() */ t1.a from t t1 where t1.a < any(select t2.b from t t2)",
-        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]]->Sel([if(isnull(test.t.a), <nil>, 1)]))->TableReader(Table(t)->HashAgg)->HashAgg->Sel([ne(Column#27, 0)])}",
+        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]]->Sel([1]))->TableReader(Table(t)->Sel([1])->HashAgg)->HashAgg->Sel([ne(Column#27, 0) 1])}",
         "Warning": ""
       },
       {
         "SQL": "select /*+ hash_agg() */ t1.a from t t1 where t1.a != any(select t2.b from t t2)",
-        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]]->Sel([if(isnull(test.t.a), <nil>, 1)]))->TableReader(Table(t))->Projection->HashAgg->Sel([ne(Column#28, 0)])}",
+        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]]->Sel([1]))->TableReader(Table(t)->Sel([1]))->HashAgg->Sel([ne(Column#28, 0) 1])}",
         "Warning": ""
       },
       {
         "SQL": "select /*+ hash_agg() */ t1.a from t t1 where t1.a = all(select t2.b from t t2)",
-        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]])->TableReader(Table(t))->Projection->HashAgg}",
+        "Best": "LeftHashJoin{IndexReader(Index(t.f)[[NULL,+inf]])->TableReader(Table(t))->HashAgg->Sel([or(and(le(Column#26, 1), if(ne(Column#27, 0), <nil>, 1)), or(eq(Column#28, 0), 0))])}",
         "Warning": ""
       },
       {
diff --git a/planner/core/testdata/plan_suite_unexported_in.json b/planner/core/testdata/plan_suite_unexported_in.json
index b71d9f9960da7..41aef7bec4ccc 100644
--- a/planner/core/testdata/plan_suite_unexported_in.json
+++ b/planner/core/testdata/plan_suite_unexported_in.json
@@ -402,6 +402,14 @@
       "select count(1) from (select count(b) as cnt from t group by c) t1"
     ]
   },
+  {
+    "name": "TestSortByItemsPruning",
+    "cases": [
+      "select * from t where a > 1 order by a asc, a asc limit 10",
+      "select * from t where a > 1 order by a asc, b asc, a asc, c asc limit 10",
+      "select * from t where a > 1 order by pow(a, 2) asc, b asc, pow(a, 2) asc, c asc limit 10"
+    ]
+  },
   {
     "name": "TestDeriveNotNullConds",
     "cases": [
diff --git a/planner/core/testdata/plan_suite_unexported_out.json b/planner/core/testdata/plan_suite_unexported_out.json
index ade08e163fe7e..699b0d3214326 100644
--- a/planner/core/testdata/plan_suite_unexported_out.json
+++ b/planner/core/testdata/plan_suite_unexported_out.json
@@ -739,6 +739,24 @@
       }
     ]
   },
+  {
+    "Name": "TestSortByItemsPruning",
+    "Cases": [
+      [
+        "test.t.a"
+      ],
+      [
+        "test.t.a",
+        "test.t.b",
+        "test.t.c"
+      ],
+      [
+        "pow(cast(test.t.a, double BINARY), 2)",
+        "test.t.b",
+        "test.t.c"
+      ]
+    ]
+  },
   {
     "Name": "TestDeriveNotNullConds",
     "Cases": [
diff --git a/server/conn.go b/server/conn.go
index fe6d8abaaa52f..0f2d50e7b5f3e 100644
--- a/server/conn.go
+++ b/server/conn.go
@@ -173,6 +173,12 @@ type clientConn struct {
 	status       int32             // dispatching/reading/shutdown/waitshutdown
 	lastCode     uint16            // last error code
 	collation    uint8             // collation used by client, may be different from the collation used by database.
+
+	// mu is used for cancelling the execution of current transaction.
+	mu struct {
+		sync.RWMutex
+		cancelFunc context.CancelFunc
+	}
 }
 
 func (cc *clientConn) String() string {
@@ -910,6 +916,13 @@ func (cc *clientConn) dispatch(ctx context.Context, data []byte) error {
 		atomic.StoreUint32(&cc.ctx.GetSessionVars().Killed, 0)
 	}()
 	span := opentracing.StartSpan("server.dispatch")
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	var cancelFunc context.CancelFunc
+	ctx, cancelFunc = context.WithCancel(ctx)
+	cc.mu.Lock()
+	cc.mu.cancelFunc = cancelFunc
+	cc.mu.Unlock()
 
 	t := time.Now()
 	cc.lastPacket = data
@@ -1387,6 +1400,17 @@ func (cc *clientConn) handleQuery(ctx context.Context, sql string) (err error) {
 
 	var pointPlans []plannercore.Plan
 	if len(stmts) > 1 {
+
+		// The client gets to choose if it allows multi-statements, and
+		// probably defaults OFF. This helps prevent against SQL injection attacks
+		// by early terminating the first statement, and then running an entirely
+		// new statement.
+
+		capabilities := cc.ctx.GetSessionVars().ClientCapability
+		if capabilities&mysql.ClientMultiStatements < 1 {
+			return errMultiStatementDisabled
+		}
+
 		// Only pre-build point plans for multi-statement query
 		pointPlans, err = cc.prefetchPointPlanKeys(ctx, stmts)
 		if err != nil {
@@ -1427,7 +1451,7 @@ func (cc *clientConn) prefetchPointPlanKeys(ctx context.Context, stmts []ast.Stm
 	}
 	vars := cc.ctx.GetSessionVars()
 	if vars.TxnCtx.IsPessimistic {
-		if vars.IsReadConsistencyTxn() {
+		if vars.IsIsolation(ast.ReadCommitted) {
 			// TODO: to support READ-COMMITTED, we need to avoid getting new TS for each statement in the query.
 			return nil, nil
 		}
diff --git a/server/conn_test.go b/server/conn_test.go
index dd4685e7c814a..8f94bda3c746d 100644
--- a/server/conn_test.go
+++ b/server/conn_test.go
@@ -680,6 +680,11 @@ func (ts *ConnTestSuite) TestPrefetchPointKeys(c *C) {
 	tk.MustExec("insert prefetch values (1, 1, 1), (2, 2, 2), (3, 3, 3)")
 	tk.MustExec("begin optimistic")
 	tk.MustExec("update prefetch set c = c + 1 where a = 2 and b = 2")
+
+	// enable multi-statement
+	capabilities := cc.ctx.GetSessionVars().ClientCapability
+	capabilities ^= mysql.ClientMultiStatements
+	cc.ctx.SetClientCapability(capabilities)
 	query := "update prefetch set c = c + 1 where a = 1 and b = 1;" +
 		"update prefetch set c = c + 1 where a = 2 and b = 2;" +
 		"update prefetch set c = c + 1 where a = 3 and b = 3;"
diff --git a/server/http_handler.go b/server/http_handler.go
old mode 100755
new mode 100644
diff --git a/server/server.go b/server/server.go
index 8954eca113a77..88f5a75882811 100644
--- a/server/server.go
+++ b/server/server.go
@@ -97,6 +97,7 @@ var (
 	errAccessDenied            = terror.ClassServer.New(errno.ErrAccessDenied, errno.MySQLErrName[errno.ErrAccessDenied])
 	errConCount                = terror.ClassServer.New(errno.ErrConCount, errno.MySQLErrName[errno.ErrConCount])
 	errSecureTransportRequired = terror.ClassServer.New(errno.ErrSecureTransportRequired, errno.MySQLErrName[errno.ErrSecureTransportRequired])
+	errMultiStatementDisabled  = terror.ClassServer.New(errno.ErrUnknown, "client has multi-statement capability disabled") // MySQL returns a parse error
 )
 
 // DefaultCapability is the capability of the server when it is created using the default configuration.
@@ -539,6 +540,12 @@ func (s *Server) getTLSConfig() *tls.Config {
 func killConn(conn *clientConn) {
 	sessVars := conn.ctx.GetSessionVars()
 	atomic.StoreUint32(&sessVars.Killed, 1)
+	conn.mu.RLock()
+	cancelFunc := conn.mu.cancelFunc
+	conn.mu.RUnlock()
+	if cancelFunc != nil {
+		cancelFunc()
+	}
 }
 
 // KillAllConnections kills all connections when server is not gracefully shutdown.
diff --git a/server/server_test.go b/server/server_test.go
index b400b54be69f5..feb14cb4ccffd 100644
--- a/server/server_test.go
+++ b/server/server_test.go
@@ -1212,8 +1212,22 @@ func (cli *testServerClient) runTestStatusAPI(c *C) {
 	c.Assert(data.GitHash, Equals, versioninfo.TiDBGitHash)
 }
 
+// The golang sql driver (and most drivers) should have multi-statement
+// disabled by default for security reasons. Lets ensure that the behavior
+// is correct.
+
+func (cli *testServerClient) runFailedTestMultiStatements(c *C) {
+	cli.runTestsOnNewDB(c, nil, "FailedMultiStatements", func(dbt *DBTest) {
+		_, err := dbt.db.Exec("SELECT 1; SELECT 1; SELECT 2; SELECT 3;")
+		c.Assert(err.Error(), Equals, "Error 1105: client has multi-statement capability disabled")
+	})
+}
+
 func (cli *testServerClient) runTestMultiStatements(c *C) {
-	cli.runTestsOnNewDB(c, nil, "MultiStatements", func(dbt *DBTest) {
+
+	cli.runTestsOnNewDB(c, func(config *mysql.Config) {
+		config.Params = map[string]string{"multiStatements": "true"}
+	}, "MultiStatements", func(dbt *DBTest) {
 		// Create Table
 		dbt.mustExec("CREATE TABLE `test` (`id` int(11) NOT NULL, `value` int(11) NOT NULL) ")
 
diff --git a/server/tidb_test.go b/server/tidb_test.go
index 2cf4f07b7752a..cdabeb1c2d27c 100644
--- a/server/tidb_test.go
+++ b/server/tidb_test.go
@@ -311,6 +311,7 @@ func newTLSHttpClient(c *C, caFile, certFile, keyFile string) *http.Client {
 
 func (ts *tidbTestSuite) TestMultiStatements(c *C) {
 	c.Parallel()
+	ts.runFailedTestMultiStatements(c)
 	ts.runTestMultiStatements(c)
 }
 
diff --git a/session/bootstrap.go b/session/bootstrap.go
index 1551a84336cb0..88bb3f62c56e3 100644
--- a/session/bootstrap.go
+++ b/session/bootstrap.go
@@ -45,23 +45,23 @@ import (
 
 const (
 	// CreateUserTable is the SQL statement creates User table in system db.
-	CreateUserTable = `CREATE TABLE if not exists mysql.user (
-		Host				CHAR(64),
-		User				CHAR(32),
+	CreateUserTable = `CREATE TABLE IF NOT EXISTS mysql.user (
+		Host					CHAR(64),
+		User					CHAR(32),
 		authentication_string	TEXT,
-		Select_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Insert_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Update_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Delete_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Create_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Drop_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Select_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Insert_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Update_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Delete_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Create_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Drop_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Process_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Grant_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Grant_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
 		References_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Alter_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Alter_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Show_db_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Super_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Create_tmp_table_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Super_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Create_tmp_table_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Lock_tables_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Execute_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Create_view_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
@@ -82,210 +82,210 @@ const (
 		Create_Tablespace_Priv    ENUM('N','Y') NOT NULL DEFAULT 'N',
 		PRIMARY KEY (Host, User));`
 	// CreateGlobalPrivTable is the SQL statement creates Global scope privilege table in system db.
-	CreateGlobalPrivTable = "CREATE TABLE if not exists mysql.global_priv (" +
-		"Host char(60) NOT NULL DEFAULT ''," +
-		"User char(80) NOT NULL DEFAULT ''," +
-		"Priv longtext NOT NULL DEFAULT ''," +
+	CreateGlobalPrivTable = "CREATE TABLE IF NOT EXISTS mysql.global_priv (" +
+		"Host CHAR(60) NOT NULL DEFAULT ''," +
+		"User CHAR(80) NOT NULL DEFAULT ''," +
+		"Priv LONGTEXT NOT NULL DEFAULT ''," +
 		"PRIMARY KEY (Host, User)" +
 		")"
 	// CreateDBPrivTable is the SQL statement creates DB scope privilege table in system db.
-	CreateDBPrivTable = `CREATE TABLE if not exists mysql.db (
-		Host			CHAR(60),
-		DB			CHAR(64),
-		User			CHAR(32),
-		Select_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Insert_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Update_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Delete_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Create_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Drop_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Grant_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		References_priv 	ENUM('N','Y') Not Null DEFAULT 'N',
-		Index_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Alter_priv		ENUM('N','Y') Not Null DEFAULT 'N',
+	CreateDBPrivTable = `CREATE TABLE IF NOT EXISTS mysql.db (
+		Host					CHAR(60),
+		DB						CHAR(64),
+		User					CHAR(32),
+		Select_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Insert_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Update_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Delete_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Create_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Drop_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Grant_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		References_priv 		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Index_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Alter_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
 		Create_tmp_table_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Lock_tables_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Create_view_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Show_view_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Create_routine_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Alter_routine_priv	ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Execute_priv		ENUM('N','Y') Not Null DEFAULT 'N',
-		Event_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
-		Trigger_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Lock_tables_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Create_view_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Show_view_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Create_routine_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Alter_routine_priv		ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Execute_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Event_priv				ENUM('N','Y') NOT NULL DEFAULT 'N',
+		Trigger_priv			ENUM('N','Y') NOT NULL DEFAULT 'N',
 		PRIMARY KEY (Host, DB, User));`
 	// CreateTablePrivTable is the SQL statement creates table scope privilege table in system db.
-	CreateTablePrivTable = `CREATE TABLE if not exists mysql.tables_priv (
+	CreateTablePrivTable = `CREATE TABLE IF NOT EXISTS mysql.tables_priv (
 		Host		CHAR(60),
-		DB		CHAR(64),
+		DB			CHAR(64),
 		User		CHAR(32),
 		Table_name	CHAR(64),
 		Grantor		CHAR(77),
-		Timestamp	Timestamp DEFAULT CURRENT_TIMESTAMP,
+		Timestamp	TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
 		Table_priv	SET('Select','Insert','Update','Delete','Create','Drop','Grant','Index','Alter','Create View','Show View','Trigger','References'),
 		Column_priv	SET('Select','Insert','Update'),
 		PRIMARY KEY (Host, DB, User, Table_name));`
 	// CreateColumnPrivTable is the SQL statement creates column scope privilege table in system db.
-	CreateColumnPrivTable = `CREATE TABLE if not exists mysql.columns_priv(
+	CreateColumnPrivTable = `CREATE TABLE IF NOT EXISTS mysql.columns_priv(
 		Host		CHAR(60),
-		DB		CHAR(64),
+		DB			CHAR(64),
 		User		CHAR(32),
 		Table_name	CHAR(64),
 		Column_name	CHAR(64),
-		Timestamp	Timestamp DEFAULT CURRENT_TIMESTAMP,
+		Timestamp	TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
 		Column_priv	SET('Select','Insert','Update'),
 		PRIMARY KEY (Host, DB, User, Table_name, Column_name));`
 	// CreateGlobalVariablesTable is the SQL statement creates global variable table in system db.
 	// TODO: MySQL puts GLOBAL_VARIABLES table in INFORMATION_SCHEMA db.
 	// INFORMATION_SCHEMA is a virtual db in TiDB. So we put this table in system db.
 	// Maybe we will put it back to INFORMATION_SCHEMA.
-	CreateGlobalVariablesTable = `CREATE TABLE if not exists mysql.GLOBAL_VARIABLES(
-		VARIABLE_NAME  VARCHAR(64) Not Null PRIMARY KEY,
-		VARIABLE_VALUE VARCHAR(1024) DEFAULT Null);`
+	CreateGlobalVariablesTable = `CREATE TABLE IF NOT EXISTS mysql.GLOBAL_VARIABLES(
+		VARIABLE_NAME  VARCHAR(64) NOT NULL PRIMARY KEY,
+		VARIABLE_VALUE VARCHAR(1024) DEFAULT NULL);`
 	// CreateTiDBTable is the SQL statement creates a table in system db.
 	// This table is a key-value struct contains some information used by TiDB.
 	// Currently we only put bootstrapped in it which indicates if the system is already bootstrapped.
-	CreateTiDBTable = `CREATE TABLE if not exists mysql.tidb(
-		VARIABLE_NAME  VARCHAR(64) Not Null PRIMARY KEY,
-		VARIABLE_VALUE VARCHAR(1024) DEFAULT Null,
-		COMMENT VARCHAR(1024));`
+	CreateTiDBTable = `CREATE TABLE IF NOT EXISTS mysql.tidb(
+		VARIABLE_NAME  	VARCHAR(64) NOT NULL PRIMARY KEY,
+		VARIABLE_VALUE 	VARCHAR(1024) DEFAULT NULL,
+		COMMENT 		VARCHAR(1024));`
 
 	// CreateHelpTopic is the SQL statement creates help_topic table in system db.
 	// See: https://dev.mysql.com/doc/refman/5.5/en/system-database.html#system-database-help-tables
-	CreateHelpTopic = `CREATE TABLE if not exists mysql.help_topic (
-  		help_topic_id int(10) unsigned NOT NULL,
-  		name char(64) NOT NULL,
-  		help_category_id smallint(5) unsigned NOT NULL,
-  		description text NOT NULL,
-  		example text NOT NULL,
-  		url text NOT NULL,
+	CreateHelpTopic = `CREATE TABLE IF NOT EXISTS mysql.help_topic (
+  		help_topic_id 		INT(10) UNSIGNED NOT NULL,
+  		name 				CHAR(64) NOT NULL,
+  		help_category_id 	SMALLINT(5) UNSIGNED NOT NULL,
+  		description 		TEXT NOT NULL,
+  		example 			TEXT NOT NULL,
+  		url 				TEXT NOT NULL,
   		PRIMARY KEY (help_topic_id),
   		UNIQUE KEY name (name)
 		) ENGINE=InnoDB DEFAULT CHARSET=utf8 STATS_PERSISTENT=0 COMMENT='help topics';`
 
 	// CreateStatsMetaTable stores the meta of table statistics.
-	CreateStatsMetaTable = `CREATE TABLE if not exists mysql.stats_meta (
-		version bigint(64) unsigned NOT NULL,
-		table_id bigint(64) NOT NULL,
-		modify_count bigint(64) NOT NULL DEFAULT 0,
-		count bigint(64) unsigned NOT NULL DEFAULT 0,
-		index idx_ver(version),
-		unique index tbl(table_id)
+	CreateStatsMetaTable = `CREATE TABLE IF NOT EXISTS mysql.stats_meta (
+		version 		BIGINT(64) UNSIGNED NOT NULL,
+		table_id 		BIGINT(64) NOT NULL,
+		modify_count	BIGINT(64) NOT NULL DEFAULT 0,
+		count 			BIGINT(64) UNSIGNED NOT NULL DEFAULT 0,
+		INDEX idx_ver(version),
+		UNIQUE INDEX tbl(table_id)
 	);`
 
 	// CreateStatsColsTable stores the statistics of table columns.
-	CreateStatsColsTable = `CREATE TABLE if not exists mysql.stats_histograms (
-		table_id bigint(64) NOT NULL,
-		is_index tinyint(2) NOT NULL,
-		hist_id bigint(64) NOT NULL,
-		distinct_count bigint(64) NOT NULL,
-		null_count bigint(64) NOT NULL DEFAULT 0,
-		tot_col_size bigint(64) NOT NULL DEFAULT 0,
-		modify_count bigint(64) NOT NULL DEFAULT 0,
-		version bigint(64) unsigned NOT NULL DEFAULT 0,
-		cm_sketch blob,
-		stats_ver bigint(64) NOT NULL DEFAULT 0,
-		flag bigint(64) NOT NULL DEFAULT 0,
-		correlation double NOT NULL DEFAULT 0,
-		last_analyze_pos blob DEFAULT NULL,
-		unique index tbl(table_id, is_index, hist_id)
+	CreateStatsColsTable = `CREATE TABLE IF NOT EXISTS mysql.stats_histograms (
+		table_id 			BIGINT(64) NOT NULL,
+		is_index 			TINYINT(2) NOT NULL,
+		hist_id 			BIGINT(64) NOT NULL,
+		distinct_count 		BIGINT(64) NOT NULL,
+		null_count 			BIGINT(64) NOT NULL DEFAULT 0,
+		tot_col_size 		BIGINT(64) NOT NULL DEFAULT 0,
+		modify_count 		BIGINT(64) NOT NULL DEFAULT 0,
+		version 			BIGINT(64) UNSIGNED NOT NULL DEFAULT 0,
+		cm_sketch 			BLOB,
+		stats_ver 			BIGINT(64) NOT NULL DEFAULT 0,
+		flag 				BIGINT(64) NOT NULL DEFAULT 0,
+		correlation 		DOUBLE NOT NULL DEFAULT 0,
+		last_analyze_pos 	BLOB DEFAULT NULL,
+		UNIQUE INDEX tbl(table_id, is_index, hist_id)
 	);`
 
 	// CreateStatsBucketsTable stores the histogram info for every table columns.
-	CreateStatsBucketsTable = `CREATE TABLE if not exists mysql.stats_buckets (
-		table_id bigint(64) NOT NULL,
-		is_index tinyint(2) NOT NULL,
-		hist_id bigint(64) NOT NULL,
-		bucket_id bigint(64) NOT NULL,
-		count bigint(64) NOT NULL,
-		repeats bigint(64) NOT NULL,
-		upper_bound blob NOT NULL,
-		lower_bound blob ,
-		unique index tbl(table_id, is_index, hist_id, bucket_id)
+	CreateStatsBucketsTable = `CREATE TABLE IF NOT EXISTS mysql.stats_buckets (
+		table_id 	BIGINT(64) NOT NULL,
+		is_index 	TINYINT(2) NOT NULL,
+		hist_id 	BIGINT(64) NOT NULL,
+		bucket_id 	BIGINT(64) NOT NULL,
+		count 		BIGINT(64) NOT NULL,
+		repeats 	BIGINT(64) NOT NULL,
+		upper_bound BLOB NOT NULL,
+		lower_bound BLOB ,
+		UNIQUE INDEX tbl(table_id, is_index, hist_id, bucket_id)
 	);`
 
 	// CreateGCDeleteRangeTable stores schemas which can be deleted by DeleteRange.
 	CreateGCDeleteRangeTable = `CREATE TABLE IF NOT EXISTS mysql.gc_delete_range (
-		job_id BIGINT NOT NULL COMMENT "the DDL job ID",
-		element_id BIGINT NOT NULL COMMENT "the schema element ID",
-		start_key VARCHAR(255) NOT NULL COMMENT "encoded in hex",
-		end_key VARCHAR(255) NOT NULL COMMENT "encoded in hex",
-		ts BIGINT NOT NULL COMMENT "timestamp in uint64",
+		job_id 		BIGINT NOT NULL COMMENT "the DDL job ID",
+		element_id 	BIGINT NOT NULL COMMENT "the schema element ID",
+		start_key 	VARCHAR(255) NOT NULL COMMENT "encoded in hex",
+		end_key 	VARCHAR(255) NOT NULL COMMENT "encoded in hex",
+		ts 			BIGINT NOT NULL COMMENT "timestamp in uint64",
 		UNIQUE KEY delete_range_index (job_id, element_id)
 	);`
 
 	// CreateGCDeleteRangeDoneTable stores schemas which are already deleted by DeleteRange.
 	CreateGCDeleteRangeDoneTable = `CREATE TABLE IF NOT EXISTS mysql.gc_delete_range_done (
-		job_id BIGINT NOT NULL COMMENT "the DDL job ID",
-		element_id BIGINT NOT NULL COMMENT "the schema element ID",
-		start_key VARCHAR(255) NOT NULL COMMENT "encoded in hex",
-		end_key VARCHAR(255) NOT NULL COMMENT "encoded in hex",
-		ts BIGINT NOT NULL COMMENT "timestamp in uint64",
+		job_id 		BIGINT NOT NULL COMMENT "the DDL job ID",
+		element_id 	BIGINT NOT NULL COMMENT "the schema element ID",
+		start_key 	VARCHAR(255) NOT NULL COMMENT "encoded in hex",
+		end_key 	VARCHAR(255) NOT NULL COMMENT "encoded in hex",
+		ts 			BIGINT NOT NULL COMMENT "timestamp in uint64",
 		UNIQUE KEY delete_range_done_index (job_id, element_id)
 	);`
 
 	// CreateStatsFeedbackTable stores the feedback info which is used to update stats.
 	CreateStatsFeedbackTable = `CREATE TABLE IF NOT EXISTS mysql.stats_feedback (
-		table_id bigint(64) NOT NULL,
-		is_index tinyint(2) NOT NULL,
-		hist_id bigint(64) NOT NULL,
-		feedback blob NOT NULL,
-		index hist(table_id, is_index, hist_id)
+		table_id 	BIGINT(64) NOT NULL,
+		is_index 	TINYINT(2) NOT NULL,
+		hist_id 	BIGINT(64) NOT NULL,
+		feedback 	BLOB NOT NULL,
+		INDEX hist(table_id, is_index, hist_id)
 	);`
 
 	// CreateBindInfoTable stores the sql bind info which is used to update globalBindCache.
 	CreateBindInfoTable = `CREATE TABLE IF NOT EXISTS mysql.bind_info (
-		original_sql text NOT NULL  ,
-      	bind_sql text NOT NULL ,
-      	default_db text  NOT NULL,
-		status text NOT NULL,
-		create_time timestamp(3) NOT NULL,
-		update_time timestamp(3) NOT NULL,
-		charset text NOT NULL,
-		collation text NOT NULL,
-		source varchar(10) NOT NULL default 'unknown',
+		original_sql	TEXT NOT NULL  ,
+      	bind_sql 		TEXT NOT NULL ,
+      	default_db 		TEXT NOT NULL,
+		status 			TEXT NOT NULL,
+		create_time 	TIMESTAMP(3) NOT NULL,
+		update_time 	TIMESTAMP(3) NOT NULL,
+		charset 		TEXT NOT NULL,
+		collation 		TEXT NOT NULL,
+		source 			VARCHAR(10) NOT NULL DEFAULT 'unknown',
 		INDEX sql_index(original_sql(1024),default_db(1024)) COMMENT "accelerate the speed when add global binding query",
 		INDEX time_index(update_time) COMMENT "accelerate the speed when querying with last update time"
 	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;`
 
 	// CreateRoleEdgesTable stores the role and user relationship information.
 	CreateRoleEdgesTable = `CREATE TABLE IF NOT EXISTS mysql.role_edges (
-		FROM_HOST char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
-		FROM_USER char(32) COLLATE utf8_bin NOT NULL DEFAULT '',
-		TO_HOST char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
-		TO_USER char(32) COLLATE utf8_bin NOT NULL DEFAULT '',
-		WITH_ADMIN_OPTION enum('N','Y') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT 'N',
+		FROM_HOST 			CHAR(60) COLLATE utf8_bin NOT NULL DEFAULT '',
+		FROM_USER 			CHAR(32) COLLATE utf8_bin NOT NULL DEFAULT '',
+		TO_HOST 			CHAR(60) COLLATE utf8_bin NOT NULL DEFAULT '',
+		TO_USER 			CHAR(32) COLLATE utf8_bin NOT NULL DEFAULT '',
+		WITH_ADMIN_OPTION 	ENUM('N','Y') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT 'N',
 		PRIMARY KEY (FROM_HOST,FROM_USER,TO_HOST,TO_USER)
 	);`
 
 	// CreateDefaultRolesTable stores the active roles for a user.
 	CreateDefaultRolesTable = `CREATE TABLE IF NOT EXISTS mysql.default_roles (
-		HOST char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
-		USER char(32) COLLATE utf8_bin NOT NULL DEFAULT '',
-		DEFAULT_ROLE_HOST char(60) COLLATE utf8_bin NOT NULL DEFAULT '%',
-		DEFAULT_ROLE_USER char(32) COLLATE utf8_bin NOT NULL DEFAULT '',
+		HOST 				CHAR(60) COLLATE utf8_bin NOT NULL DEFAULT '',
+		USER 				CHAR(32) COLLATE utf8_bin NOT NULL DEFAULT '',
+		DEFAULT_ROLE_HOST 	CHAR(60) COLLATE utf8_bin NOT NULL DEFAULT '%',
+		DEFAULT_ROLE_USER 	CHAR(32) COLLATE utf8_bin NOT NULL DEFAULT '',
 		PRIMARY KEY (HOST,USER,DEFAULT_ROLE_HOST,DEFAULT_ROLE_USER)
 	)`
 
 	// CreateStatsTopNTable stores topn data of a cmsketch with top n.
-	CreateStatsTopNTable = `CREATE TABLE if not exists mysql.stats_top_n (
-		table_id bigint(64) NOT NULL,
-		is_index tinyint(2) NOT NULL,
-		hist_id bigint(64) NOT NULL,
-		value longblob,
-		count bigint(64) UNSIGNED NOT NULL,
-		index tbl(table_id, is_index, hist_id)
+	CreateStatsTopNTable = `CREATE TABLE IF NOT EXISTS mysql.stats_top_n (
+		table_id 	BIGINT(64) NOT NULL,
+		is_index 	TINYINT(2) NOT NULL,
+		hist_id 	BIGINT(64) NOT NULL,
+		value 		LONGBLOB,
+		count 		BIGINT(64) UNSIGNED NOT NULL,
+		INDEX tbl(table_id, is_index, hist_id)
 	);`
 
 	// CreateExprPushdownBlacklist stores the expressions which are not allowed to be pushed down.
 	CreateExprPushdownBlacklist = `CREATE TABLE IF NOT EXISTS mysql.expr_pushdown_blacklist (
-		name char(100) NOT NULL,
-		store_type char(100) NOT NULL DEFAULT 'tikv,tiflash,tidb',
-		reason varchar(200)
+		name 		CHAR(100) NOT NULL,
+		store_type 	CHAR(100) NOT NULL DEFAULT 'tikv,tiflash,tidb',
+		reason 		VARCHAR(200)
 	);`
 
 	// CreateOptRuleBlacklist stores the list of disabled optimizing operations.
 	CreateOptRuleBlacklist = `CREATE TABLE IF NOT EXISTS mysql.opt_rule_blacklist (
-		name char(100) NOT NULL
+		name 	CHAR(100) NOT NULL
 	);`
 
 	// CreateStatsExtended stores the registered extended statistics.
@@ -598,7 +598,7 @@ func upgradeToVer3(s Session, ver int64) {
 		return
 	}
 	// Version 3 fix tx_read_only variable value.
-	sql := fmt.Sprintf("UPDATE HIGH_PRIORITY %s.%s set variable_value = '0' where variable_name = 'tx_read_only';",
+	sql := fmt.Sprintf("UPDATE HIGH_PRIORITY %s.%s SET variable_value = '0' WHERE variable_name = 'tx_read_only';",
 		mysql.SystemDB, mysql.GlobalVariablesTable)
 	mustExecute(s, sql)
 }
@@ -624,7 +624,7 @@ func upgradeToVer6(s Session, ver int64) {
 	if ver >= version6 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Super_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_db_priv`", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Super_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_db_priv`", infoschema.ErrColumnExists)
 	// For reasons of compatibility, set the non-exists privilege column value to 'Y', as TiDB doesn't check them in older versions.
 	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Super_priv='Y'")
 }
@@ -633,7 +633,7 @@ func upgradeToVer7(s Session, ver int64) {
 	if ver >= version7 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Process_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Drop_priv`", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Process_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Drop_priv`", infoschema.ErrColumnExists)
 	// For reasons of compatibility, set the non-exists privilege column value to 'Y', as TiDB doesn't check them in older versions.
 	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Process_priv='Y'")
 }
@@ -643,7 +643,7 @@ func upgradeToVer8(s Session, ver int64) {
 		return
 	}
 	// This is a dummy upgrade, it checks whether upgradeToVer7 success, if not, do it again.
-	if _, err := s.Execute(context.Background(), "SELECT HIGH_PRIORITY `Process_priv` from mysql.user limit 0"); err == nil {
+	if _, err := s.Execute(context.Background(), "SELECT HIGH_PRIORITY `Process_priv` FROM mysql.user LIMIT 0"); err == nil {
 		return
 	}
 	upgradeToVer7(s, ver)
@@ -653,7 +653,7 @@ func upgradeToVer9(s Session, ver int64) {
 	if ver >= version9 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Trigger_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_user_priv`", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Trigger_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_user_priv`", infoschema.ErrColumnExists)
 	// For reasons of compatibility, set the non-exists privilege column value to 'Y', as TiDB doesn't check them in older versions.
 	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Trigger_priv='Y'")
 }
@@ -676,7 +676,7 @@ func upgradeToVer10(s Session, ver int64) {
 	}
 	doReentrantDDL(s, "ALTER TABLE mysql.stats_buckets CHANGE COLUMN `value` `upper_bound` BLOB NOT NULL", infoschema.ErrColumnNotExists, infoschema.ErrColumnExists)
 	doReentrantDDL(s, "ALTER TABLE mysql.stats_buckets ADD COLUMN `lower_bound` BLOB", infoschema.ErrColumnExists)
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `null_count` bigint(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `null_count` BIGINT(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
 	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms DROP COLUMN distinct_ratio", ddl.ErrCantDropFieldOrKey)
 	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms DROP COLUMN use_count_to_estimate", ddl.ErrCantDropFieldOrKey)
 }
@@ -685,7 +685,7 @@ func upgradeToVer11(s Session, ver int64) {
 	if ver >= version11 {
 		return
 	}
-	_, err := s.Execute(context.Background(), "ALTER TABLE mysql.user ADD COLUMN `References_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Grant_priv`")
+	_, err := s.Execute(context.Background(), "ALTER TABLE mysql.user ADD COLUMN `References_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Grant_priv`")
 	if err != nil {
 		if terror.ErrorEqual(err, infoschema.ErrColumnExists) {
 			return
@@ -723,7 +723,7 @@ func upgradeToVer12(s Session, ver int64) {
 			var newPass string
 			newPass, err = oldPasswordUpgrade(pass)
 			terror.MustNil(err)
-			updateSQL := fmt.Sprintf(`UPDATE HIGH_PRIORITY mysql.user set password = "%s" where user="%s" and host="%s"`, newPass, user, host)
+			updateSQL := fmt.Sprintf(`UPDATE HIGH_PRIORITY mysql.user SET password = "%s" WHERE user="%s" AND host="%s"`, newPass, user, host)
 			sqls = append(sqls, updateSQL)
 		}
 		err = r.Next(ctx, req)
@@ -746,13 +746,13 @@ func upgradeToVer13(s Session, ver int64) {
 		return
 	}
 	sqls := []string{
-		"ALTER TABLE mysql.user ADD COLUMN `Create_tmp_table_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Super_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Lock_tables_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_tmp_table_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Create_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Execute_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Show_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_view_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Create_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_view_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Alter_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_routine_priv`",
-		"ALTER TABLE mysql.user ADD COLUMN `Event_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_user_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Create_tmp_table_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Super_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Lock_tables_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_tmp_table_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Create_view_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Execute_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Show_view_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_view_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Create_routine_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_view_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Alter_routine_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_routine_priv`",
+		"ALTER TABLE mysql.user ADD COLUMN `Event_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_user_priv`",
 	}
 	ctx := context.Background()
 	for _, sql := range sqls {
@@ -773,15 +773,15 @@ func upgradeToVer14(s Session, ver int64) {
 		return
 	}
 	sqls := []string{
-		"ALTER TABLE mysql.db ADD COLUMN `References_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Grant_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Create_tmp_table_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Alter_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Lock_tables_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_tmp_table_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Create_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Lock_tables_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Show_view_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_view_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Create_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_view_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Alter_routine_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_routine_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Event_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Execute_priv`",
-		"ALTER TABLE mysql.db ADD COLUMN `Trigger_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Event_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `References_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Grant_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Create_tmp_table_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Alter_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Lock_tables_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_tmp_table_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Create_view_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Lock_tables_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Show_view_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_view_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Create_routine_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Show_view_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Alter_routine_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Create_routine_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Event_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Execute_priv`",
+		"ALTER TABLE mysql.db ADD COLUMN `Trigger_priv` ENUM('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N' AFTER `Event_priv`",
 	}
 	ctx := context.Background()
 	for _, sql := range sqls {
@@ -810,7 +810,7 @@ func upgradeToVer16(s Session, ver int64) {
 	if ver >= version16 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `cm_sketch` blob", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `cm_sketch` BLOB", infoschema.ErrColumnExists)
 }
 
 func upgradeToVer17(s Session, ver int64) {
@@ -824,7 +824,7 @@ func upgradeToVer18(s Session, ver int64) {
 	if ver >= version18 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `tot_col_size` bigint(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `tot_col_size` BIGINT(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
 }
 
 func upgradeToVer19(s Session, ver int64) {
@@ -858,14 +858,14 @@ func upgradeToVer22(s Session, ver int64) {
 	if ver >= version22 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `stats_ver` bigint(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `stats_ver` BIGINT(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
 }
 
 func upgradeToVer23(s Session, ver int64) {
 	if ver >= version23 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `flag` bigint(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `flag` BIGINT(64) NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
 }
 
 // writeSystemTZ writes system timezone info into mysql.tidb
@@ -912,7 +912,7 @@ func upgradeToVer27(s Session, ver int64) {
 	if ver >= version27 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `correlation` double NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `correlation` DOUBLE NOT NULL DEFAULT 0", infoschema.ErrColumnExists)
 }
 
 func upgradeToVer28(s Session, ver int64) {
@@ -927,9 +927,9 @@ func upgradeToVer29(s Session, ver int64) {
 	if ver != version28 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.bind_info change create_time create_time timestamp(3)")
-	doReentrantDDL(s, "ALTER TABLE mysql.bind_info change update_time update_time timestamp(3)")
-	doReentrantDDL(s, "ALTER TABLE mysql.bind_info add index sql_index (original_sql(1024),default_db(1024))", ddl.ErrDupKeyName)
+	doReentrantDDL(s, "ALTER TABLE mysql.bind_info CHANGE create_time create_time TIMESTAMP(3)")
+	doReentrantDDL(s, "ALTER TABLE mysql.bind_info CHANGE update_time update_time TIMESTAMP(3)")
+	doReentrantDDL(s, "ALTER TABLE mysql.bind_info ADD INDEX sql_index (original_sql(1024),default_db(1024))", ddl.ErrDupKeyName)
 }
 
 func upgradeToVer30(s Session, ver int64) {
@@ -943,7 +943,7 @@ func upgradeToVer31(s Session, ver int64) {
 	if ver >= version31 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `last_analyze_pos` blob default null", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.stats_histograms ADD COLUMN `last_analyze_pos` BLOB DEFAULT NULL", infoschema.ErrColumnExists)
 }
 
 func upgradeToVer32(s Session, ver int64) {
@@ -982,7 +982,7 @@ func upgradeToVer36(s Session, ver int64) {
 	}
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Shutdown_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
 	// A root user will have those privileges after upgrading.
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Shutdown_priv='Y' where Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Shutdown_priv='Y' WHERE Super_priv='Y'")
 	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Create_tmp_table_priv='Y',Lock_tables_priv='Y',Create_routine_priv='Y',Alter_routine_priv='Y',Event_priv='Y' WHERE Super_priv='Y'")
 }
 
@@ -1013,8 +1013,8 @@ func upgradeToVer39(s Session, ver int64) {
 	}
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Reload_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `File_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Reload_priv='Y' where Super_priv='Y'")
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET File_priv='Y' where Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Reload_priv='Y' WHERE Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET File_priv='Y' WHERE Super_priv='Y'")
 }
 
 func writeNewCollationParameter(s Session, flag bool) {
@@ -1055,8 +1055,8 @@ func upgradeToVer42(s Session, ver int64) {
 	if ver >= version42 {
 		return
 	}
-	doReentrantDDL(s, "ALTER TABLE mysql.expr_pushdown_blacklist ADD COLUMN `store_type` char(100) NOT NULL DEFAULT 'tikv,tiflash,tidb'", infoschema.ErrColumnExists)
-	doReentrantDDL(s, "ALTER TABLE mysql.expr_pushdown_blacklist ADD COLUMN `reason` varchar(200)", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.expr_pushdown_blacklist ADD COLUMN `store_type` CHAR(100) NOT NULL DEFAULT 'tikv,tiflash,tidb'", infoschema.ErrColumnExists)
+	doReentrantDDL(s, "ALTER TABLE mysql.expr_pushdown_blacklist ADD COLUMN `reason` VARCHAR(200)", infoschema.ErrColumnExists)
 	writeDefaultExprPushDownBlacklist(s)
 }
 
@@ -1091,7 +1091,7 @@ func upgradeToVer45(s Session, ver int64) {
 		return
 	}
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Config_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Config_priv='Y' where Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Config_priv='Y' WHERE Super_priv='Y'")
 }
 
 // In v3.1.1, we wrongly replace the context of upgradeToVer39 with upgradeToVer44. If we upgrade from v3.1.1 to a newer version,
@@ -1102,8 +1102,8 @@ func upgradeToVer46(s Session, ver int64) {
 	}
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `Reload_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
 	doReentrantDDL(s, "ALTER TABLE mysql.user ADD COLUMN `File_priv` ENUM('N','Y') DEFAULT 'N'", infoschema.ErrColumnExists)
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Reload_priv='Y' where Super_priv='Y'")
-	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET File_priv='Y' where Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET Reload_priv='Y' WHERE Super_priv='Y'")
+	mustExecute(s, "UPDATE HIGH_PRIORITY mysql.user SET File_priv='Y' WHERE Super_priv='Y'")
 }
 
 func upgradeToVer47(s Session, ver int64) {
diff --git a/session/pessimistic_test.go b/session/pessimistic_test.go
index 66a2b405fff64..f5cb3046e1dbe 100644
--- a/session/pessimistic_test.go
+++ b/session/pessimistic_test.go
@@ -815,6 +815,145 @@ func (s *testPessimisticSuite) TestBatchPointGetWriteConflict(c *C) {
 	tk1.MustExec("commit")
 }
 
+func (s *testPessimisticSuite) TestPessimisticSerializable(c *C) {
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("use test")
+	tk1 := testkit.NewTestKitWithInit(c, s.store)
+	tk1.MustExec("use test")
+
+	tk.MustExec("set tidb_txn_mode = 'pessimistic'")
+	tk1.MustExec("set tidb_txn_mode = 'pessimistic'")
+
+	tk.MustExec("drop table if exists test;")
+	tk.MustExec("create table test (id int not null primary key, value int);")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("set tidb_skip_isolation_level_check = 1")
+	tk1.MustExec("set tidb_skip_isolation_level_check = 1")
+	tk.MustExec("set tx_isolation = 'SERIALIZABLE'")
+	tk1.MustExec("set tx_isolation = 'SERIALIZABLE'")
+
+	// Predicate-Many-Preceders (PMP)
+	tk.MustExec("begin")
+	tk1.MustExec("begin")
+	tk.MustQuery("select * from test where value = 30;").Check(testkit.Rows())
+	tk1.MustExec("insert into test (id, value) values(3, 30);")
+	tk1.MustExec("commit")
+	tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows())
+	tk.MustExec("commit")
+
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustExec("update test set value = value + 10;")
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		tk1.ExecToErr("delete from test where value = 20;")
+		wg.Done()
+	}()
+	tk.MustExec("commit;")
+	wg.Wait()
+	tk1.MustExec("rollback;")
+
+	// Lost Update (P4)
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
+	tk1.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
+	tk.MustExec("update test set value = 11 where id = 1;")
+
+	wg.Add(1)
+	go func() {
+		tk1.ExecToErr("update test set value = 11 where id = 1;")
+		wg.Done()
+	}()
+	tk.MustExec("commit;")
+	wg.Wait()
+	tk1.MustExec("rollback;")
+
+	// Read Skew (G-single)
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
+	tk1.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
+	tk1.MustQuery("select * from test where id = 2;").Check(testkit.Rows("2 20"))
+	tk1.MustExec("update test set value = 12 where id = 1;")
+	tk1.MustExec("update test set value = 18 where id = 1;")
+	tk1.MustExec("commit;")
+	tk.MustQuery("select * from test where id = 2;").Check(testkit.Rows("2 20"))
+	tk.MustExec("commit;")
+
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where mod(value, 5) = 0;").Check(testkit.Rows("1 10", "2 20"))
+	tk1.MustExec("update test set value = 12 where value = 10;")
+	tk1.MustExec("commit;")
+	tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows())
+	tk.MustExec("commit;")
+
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
+	tk1.MustQuery("select * from test;").Check(testkit.Rows("1 10", "2 20"))
+	tk1.MustExec("update test set value = 12 where id = 1;")
+	tk1.MustExec("update test set value = 18 where id = 1;")
+	tk1.MustExec("commit;")
+	tk.ExecToErr("delete from test where value = 20;")
+	tk.MustExec("rollback;")
+
+	// Write Skew (G2-item)
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where id in (1,2);").Check(testkit.Rows("1 10", "2 20"))
+	tk1.MustQuery("select * from test where id in (1,2);").Check(testkit.Rows("1 10", "2 20"))
+	tk1.MustExec("update test set value = 11 where id = 1;")
+	tk1.MustExec("update test set value = 21 where id = 2;")
+	tk.MustExec("commit;")
+	tk1.MustExec("commit;")
+	tk.MustQuery("select * from test;").Check(testkit.Rows("1 11", "2 21"))
+
+	// Anti-Dependency Cycles (G2)
+	tk.MustExec("truncate table test;")
+	tk.MustExec("insert into test (id, value) values (1, 10);")
+	tk.MustExec("insert into test (id, value) values (2, 20);")
+
+	tk.MustExec("begin;")
+	tk1.MustExec("begin;")
+	tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows())
+	tk1.MustQuery("select * from test where mod(value, 5) = 0;").Check(testkit.Rows("1 10", "2 20"))
+	tk.MustExec("insert into test (id, value) values(3, 30);")
+	tk1.MustExec("insert into test (id, value) values(4, 60);")
+	tk.MustExec("commit;")
+	tk1.MustExec("commit;")
+	tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows("3 30", "4 60"))
+}
+
 func (s *testPessimisticSuite) TestPessimisticReadCommitted(c *C) {
 	tk := testkit.NewTestKitWithInit(c, s.store)
 	tk.MustExec("use test")
@@ -1824,3 +1963,33 @@ func (s *testPessimisticSuite) TestSelectForUpdateConflictRetry(c *C) {
 	// should increase
 	c.Assert(tk3LastTs, Greater, tk2LastTS)
 }
+
+func (s *testPessimisticSuite) TestAsyncCommitWithSchemaChange(c *C) {
+	defer config.RestoreFunc()()
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.TiKVClient.AsyncCommit.Enable = true
+	})
+	c.Assert(failpoint.Enable("github.com/pingcap/tidb/store/tikv/beforeSchemaCheck", "return"), IsNil)
+	defer func() {
+		c.Assert(failpoint.Disable("github.com/pingcap/tidb/store/tikv/beforeSchemaCheck"), IsNil)
+	}()
+
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("drop table if exists tk")
+	tk.MustExec("create table tk (c1 int primary key, c2 int)")
+	tk.MustExec("insert into tk values(1,1),(2,2)")
+	tk2 := testkit.NewTestKitWithInit(c, s.store)
+	tk3 := testkit.NewTestKitWithInit(c, s.store)
+
+	// The txn tk writes something but with failpoint the primary key is not committed.
+	tk.MustExec("begin optimistic")
+	// Change the schema version.
+	tk2.MustExec("alter table tk add column c3 int after c2")
+	tk.MustExec("insert into tk values(3, 3)")
+	tk.MustExec("commit")
+
+	// Trigger the recovery process, the left locks should not be committed.
+	tk3.MustExec("begin")
+	tk3.MustQuery("select * from tk").Check(testkit.Rows("1 1 <nil>", "2 2 <nil>"))
+	tk3.MustExec("rollback")
+}
diff --git a/session/session.go b/session/session.go
index 677e19a540704..6a8cbe1178882 100644
--- a/session/session.go
+++ b/session/session.go
@@ -509,8 +509,10 @@ func (s *session) doCommitWithRetry(ctx context.Context) error {
 	}
 	mapper := s.GetSessionVars().TxnCtx.TableDeltaMap
 	if s.statsCollector != nil && mapper != nil {
-		for id, item := range mapper {
-			s.statsCollector.Update(id, item.Delta, item.Count, &item.ColSize)
+		for _, item := range mapper {
+			if item.TableID > 0 {
+				s.statsCollector.Update(item.TableID, item.Delta, item.Count, &item.ColSize)
+			}
 		}
 	}
 	return nil
@@ -786,6 +788,7 @@ func (s *session) ExecRestrictedSQLWithContext(ctx context.Context, sql string)
 		se.sessionVars.PartitionPruneMode.Store(prePruneMode)
 		s.sysSessionPool().Put(tmp)
 	}()
+	// for analyze stmt we need let worker session follow user session that executing stmt.
 	se.sessionVars.PartitionPruneMode.Store(s.sessionVars.PartitionPruneMode.Load())
 	metrics.SessionRestrictedSQLCounter.Inc()
 
@@ -1005,6 +1008,12 @@ func (s *session) SetGlobalSysVar(name, value string) error {
 			return err
 		}
 	}
+	if name == variable.TiDBPartitionPruneMode && value == string(variable.DynamicOnly) {
+		err := s.ensureFullGlobalStats()
+		if err != nil {
+			return err
+		}
+	}
 	var sVal string
 	var err error
 	sVal, err = variable.ValidateSetSystemVar(s.sessionVars, name, value, variable.ScopeGlobal)
@@ -1019,6 +1028,20 @@ func (s *session) SetGlobalSysVar(name, value string) error {
 	return err
 }
 
+func (s *session) ensureFullGlobalStats() error {
+	rows, _, err := s.ExecRestrictedSQL(`select count(1) from information_schema.tables t where t.create_options = 'partitioned'
+		and not exists (select 1 from mysql.stats_meta m where m.table_id = t.tidb_table_id)`)
+	if err != nil {
+		return err
+	}
+	row := rows[0]
+	count := row.GetInt64(0)
+	if count > 0 {
+		return errors.New("need analyze all partition table in 'static-collect-dynamic' mode before switch to 'dynamic-only'")
+	}
+	return nil
+}
+
 func (s *session) ParseSQL(ctx context.Context, sql, charset, collation string) ([]ast.StmtNode, []error, error) {
 	if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
 		span1 := span.Tracer().StartSpan("session.ParseSQL", opentracing.ChildOf(span.Context()))
@@ -1225,6 +1248,7 @@ func runStmt(ctx context.Context, se *session, s sqlexec.Statement) (rs sqlexec.
 				se.StmtCommit()
 			}
 		}
+		err = finishStmt(ctx, se, err, s)
 	}
 	if rs != nil {
 		return &execStmtResult{
@@ -1234,8 +1258,6 @@ func runStmt(ctx context.Context, se *session, s sqlexec.Statement) (rs sqlexec.
 		}, err
 	}
 
-	err = finishStmt(ctx, se, err, s)
-
 	// If it is not a select statement, we record its slow log here,
 	// then it could include the transaction commit time.
 	s.(*executor.ExecStmt).FinishExecuteStmt(origTxnCtx.StartTS, err == nil, false)
@@ -2303,7 +2325,7 @@ func logQuery(query string, vars *variable.SessionVars) {
 			zap.Int64("schemaVersion", vars.TxnCtx.SchemaVersion),
 			zap.Uint64("txnStartTS", vars.TxnCtx.StartTS),
 			zap.Uint64("forUpdateTS", vars.TxnCtx.GetForUpdateTS()),
-			zap.Bool("isReadConsistency", vars.IsReadConsistencyTxn()),
+			zap.Bool("isReadConsistency", vars.IsIsolation(ast.ReadCommitted)),
 			zap.String("current_db", vars.CurrentDB),
 			zap.String("txn_mode", vars.GetReadableTxnMode()),
 			zap.String("sql", query))
diff --git a/sessionctx/variable/session.go b/sessionctx/variable/session.go
index 3bb947b2a9bfa..5648433063088 100644
--- a/sessionctx/variable/session.go
+++ b/sessionctx/variable/session.go
@@ -215,7 +215,7 @@ func (tc *TransactionContext) CollectUnchangedRowKeys(buf []kv.Key) []kv.Key {
 }
 
 // UpdateDeltaForTable updates the delta info for some table.
-func (tc *TransactionContext) UpdateDeltaForTable(physicalTableID int64, delta int64, count int64, colSize map[int64]int64) {
+func (tc *TransactionContext) UpdateDeltaForTable(logicalTableID, physicalTableID int64, delta int64, count int64, colSize map[int64]int64, saveAsLogicalTblID bool) {
 	if tc.TableDeltaMap == nil {
 		tc.TableDeltaMap = make(map[int64]TableDelta)
 	}
@@ -225,6 +225,10 @@ func (tc *TransactionContext) UpdateDeltaForTable(physicalTableID int64, delta i
 	}
 	item.Delta += delta
 	item.Count += count
+	item.TableID = physicalTableID
+	if saveAsLogicalTblID {
+		item.TableID = logicalTableID
+	}
 	for key, val := range colSize {
 		item.ColSize[key] += val
 	}
@@ -837,6 +841,7 @@ func NewSessionVars() *SessionVars {
 		ShardAllocateStep:           DefTiDBShardAllocateStep,
 		EnableChangeColumnType:      DefTiDBChangeColumnType,
 		EnableAmendPessimisticTxn:   DefTiDBEnableAmendPessimisticTxn,
+		PartitionPruneMode:          *atomic2.NewString(DefTiDBPartitionPruneMode),
 	}
 	vars.KVVars = kv.NewVariables(&vars.Killed)
 	vars.Concurrency = Concurrency{
@@ -1035,10 +1040,10 @@ func (s *SessionVars) IsAutocommit() bool {
 	return s.GetStatusFlag(mysql.ServerStatusAutocommit)
 }
 
-// IsReadConsistencyTxn if true it means the transaction is an read consistency (read committed) transaction.
-func (s *SessionVars) IsReadConsistencyTxn() bool {
+// IsIsolation if true it means the transaction is at that isolation level.
+func (s *SessionVars) IsIsolation(isolation string) bool {
 	if s.TxnCtx.Isolation != "" {
-		return s.TxnCtx.Isolation == ast.ReadCommitted
+		return s.TxnCtx.Isolation == isolation
 	}
 	if s.txnIsolationLevelOneShot.state == oneShotUse {
 		s.TxnCtx.Isolation = s.txnIsolationLevelOneShot.value
@@ -1046,7 +1051,7 @@ func (s *SessionVars) IsReadConsistencyTxn() bool {
 	if s.TxnCtx.Isolation == "" {
 		s.TxnCtx.Isolation, _ = s.GetSystemVar(TxnIsolation)
 	}
-	return s.TxnCtx.Isolation == ast.ReadCommitted
+	return s.TxnCtx.Isolation == isolation
 }
 
 // SetTxnIsolationLevelOneShotStateForNextTxn sets the txnIsolationLevelOneShot.state for next transaction.
@@ -1064,7 +1069,7 @@ func (s *SessionVars) SetTxnIsolationLevelOneShotStateForNextTxn() {
 
 // IsPessimisticReadConsistency if true it means the statement is in an read consistency pessimistic transaction.
 func (s *SessionVars) IsPessimisticReadConsistency() bool {
-	return s.TxnCtx.IsPessimistic && s.IsReadConsistencyTxn()
+	return s.TxnCtx.IsPessimistic && s.IsIsolation(ast.ReadCommitted)
 }
 
 // GetNextPreparedStmtID generates and returns the next session scope prepared statement id.
@@ -1555,6 +1560,7 @@ type TableDelta struct {
 	Count    int64
 	ColSize  map[int64]int64
 	InitTime time.Time // InitTime is the time that this delta is generated.
+	TableID  int64
 }
 
 // ConcurrencyUnset means the value the of the concurrency related variable is unset.
diff --git a/sessionctx/variable/sysvar.go b/sessionctx/variable/sysvar.go
index a613745326521..bb1314269ba05 100644
--- a/sessionctx/variable/sysvar.go
+++ b/sessionctx/variable/sysvar.go
@@ -14,6 +14,7 @@
 package variable
 
 import (
+	"math"
 	"strconv"
 	"strings"
 	"sync"
@@ -40,24 +41,26 @@ const (
 	// ScopeSession means the system variable can only be changed in current session.
 	ScopeSession ScopeFlag = 1 << 1
 
+	// TypeUnknown for not yet defined
+	TypeUnknown TypeFlag = 0
 	// TypeBool for boolean
-	TypeBool TypeFlag = 0
+	TypeBool TypeFlag = 1
 	// TypeInt for integer
-	TypeInt TypeFlag = 1
+	TypeInt TypeFlag = 2
 	// TypeLong for Long
-	TypeLong TypeFlag = 2
+	TypeLong TypeFlag = 3
 	// TypeLongLong for LongLong
-	TypeLongLong TypeFlag = 3
+	TypeLongLong TypeFlag = 4
 	// TypeStr for String
-	TypeStr TypeFlag = 4
+	TypeStr TypeFlag = 5
 	// TypeEnum for Enum
-	TypeEnum TypeFlag = 5
+	TypeEnum TypeFlag = 6
 	// TypeSet for Set
-	TypeSet TypeFlag = 6
+	TypeSet TypeFlag = 7
 	// TypeDouble for Double
-	TypeDouble TypeFlag = 7
+	TypeDouble TypeFlag = 8
 	// TypeUnsigned for Unsigned integer
-	TypeUnsigned TypeFlag = 8
+	TypeUnsigned TypeFlag = 9
 )
 
 // SysVar is for system variable.
@@ -78,7 +81,13 @@ type SysVar struct {
 	MinValue int64
 
 	// MaxValue will automatically be validated when specified (optional)
-	MaxValue int64
+	MaxValue uint64
+
+	// AutoConvertNegativeBool applies to boolean types (optional)
+	AutoConvertNegativeBool bool
+
+	// AutoConvertOutOfRange applies to int and unsigned types.
+	AutoConvertOutOfRange bool
 }
 
 var sysVars map[string]*SysVar
@@ -152,57 +161,57 @@ func BoolToInt32(b bool) int32 {
 // we only support MySQL now
 var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "gtid_mode", Value: "OFF", Type: TypeBool},
-	{Scope: ScopeGlobal, Name: FlushTime, Value: "0"},
+	{Scope: ScopeGlobal, Name: FlushTime, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: secondsPerYear, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "performance_schema_max_mutex_classes", Value: "200"},
-	{Scope: ScopeGlobal | ScopeSession, Name: LowPriorityUpdates, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: LowPriorityUpdates, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: SessionTrackGtids, Value: "OFF"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "ndbinfo_max_rows", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "ndb_index_stat_option", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: OldPasswords, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: OldPasswords, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 2, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "innodb_version", Value: "5.6.25"},
-	{Scope: ScopeGlobal, Name: MaxConnections, Value: "151"},
-	{Scope: ScopeGlobal | ScopeSession, Name: BigTables, Value: "0"},
+	{Scope: ScopeGlobal, Name: MaxConnections, Value: "151", Type: TypeUnsigned, MinValue: 1, MaxValue: 100000, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: BigTables, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "skip_external_locking", Value: "1"},
 	{Scope: ScopeNone, Name: "innodb_sync_array_size", Value: "1"},
 	{Scope: ScopeSession, Name: "rand_seed2", Value: ""},
-	{Scope: ScopeGlobal, Name: ValidatePasswordCheckUserName, Value: "0"},
-	{Scope: ScopeGlobal, Name: "validate_password_number_count", Value: "1"},
+	{Scope: ScopeGlobal, Name: ValidatePasswordCheckUserName, Value: "0", Type: TypeBool},
+	{Scope: ScopeGlobal, Name: ValidatePasswordNumberCount, Value: "1", Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
 	{Scope: ScopeSession, Name: "gtid_next", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLSelectLimit, Value: "18446744073709551615"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLSelectLimit, Value: "18446744073709551615", Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal, Name: "ndb_show_foreign_key_mock_tables", Value: ""},
 	{Scope: ScopeNone, Name: "multi_range_count", Value: "256"},
-	{Scope: ScopeGlobal | ScopeSession, Name: DefaultWeekFormat, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: DefaultWeekFormat, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 7, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: "binlog_error_action", Value: "IGNORE_ERROR"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "default_storage_engine", Value: "InnoDB"},
 	{Scope: ScopeNone, Name: "ft_query_expansion_limit", Value: "20"},
-	{Scope: ScopeGlobal, Name: MaxConnectErrors, Value: "100"},
-	{Scope: ScopeGlobal, Name: SyncBinlog, Value: "0"},
+	{Scope: ScopeGlobal, Name: MaxConnectErrors, Value: "100", Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal, Name: SyncBinlog, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 4294967295, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "max_digest_length", Value: "1024"},
 	{Scope: ScopeNone, Name: "innodb_force_load_corrupted", Value: "0"},
 	{Scope: ScopeNone, Name: "performance_schema_max_table_handles", Value: "4000"},
-	{Scope: ScopeGlobal, Name: InnodbFastShutdown, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbFastShutdown, Value: "1", Type: TypeUnsigned, MinValue: 0, MaxValue: 2, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "ft_max_word_len", Value: "84"},
 	{Scope: ScopeGlobal, Name: "log_backward_compatible_user_definitions", Value: ""},
 	{Scope: ScopeNone, Name: "lc_messages_dir", Value: "/usr/local/mysql-5.6.25-osx10.8-x86_64/share/"},
 	{Scope: ScopeGlobal, Name: "ft_boolean_syntax", Value: "+ -><()~*:\"\"&|"},
-	{Scope: ScopeGlobal, Name: TableDefinitionCache, Value: "-1"},
-	{Scope: ScopeNone, Name: SkipNameResolve, Value: "0"},
+	{Scope: ScopeGlobal, Name: TableDefinitionCache, Value: "-1", Type: TypeUnsigned, MinValue: 400, MaxValue: 524288, AutoConvertOutOfRange: true},
+	{Scope: ScopeNone, Name: SkipNameResolve, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "performance_schema_max_file_handles", Value: "32768"},
 	{Scope: ScopeSession, Name: "transaction_allow_batching", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: SQLModeVar, Value: mysql.DefaultSQLMode},
 	{Scope: ScopeNone, Name: "performance_schema_max_statement_classes", Value: "168"},
 	{Scope: ScopeGlobal, Name: "server_id", Value: "0"},
 	{Scope: ScopeGlobal, Name: "innodb_flushing_avg_loops", Value: "30"},
-	{Scope: ScopeGlobal | ScopeSession, Name: TmpTableSize, Value: "16777216"},
+	{Scope: ScopeGlobal | ScopeSession, Name: TmpTableSize, Value: "16777216", Type: TypeUnsigned, MinValue: 1024, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal, Name: "innodb_max_purge_lag", Value: "0"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "preload_buffer_size", Value: "32768"},
-	{Scope: ScopeGlobal, Name: CheckProxyUsers, Value: "0"},
+	{Scope: ScopeGlobal, Name: CheckProxyUsers, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "have_query_cache", Value: "YES"},
 	{Scope: ScopeGlobal, Name: "innodb_flush_log_at_timeout", Value: "1"},
 	{Scope: ScopeGlobal, Name: "innodb_max_undo_log_size", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "range_alloc_block_size", Value: "4096"},
-	{Scope: ScopeGlobal, Name: ConnectTimeout, Value: "10"},
-	{Scope: ScopeGlobal | ScopeSession, Name: MaxExecutionTime, Value: "0"},
+	{Scope: ScopeGlobal, Name: ConnectTimeout, Value: "10", Type: TypeUnsigned, MinValue: 2, MaxValue: secondsPerYear, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: MaxExecutionTime, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: CollationServer, Value: mysql.DefaultCollationName},
 	{Scope: ScopeNone, Name: "have_rtree_keys", Value: "YES"},
 	{Scope: ScopeGlobal, Name: "innodb_old_blocks_pct", Value: "37"},
@@ -213,8 +222,8 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "innodb_ft_sort_pll_degree", Value: "2"},
 	{Scope: ScopeNone, Name: "thread_stack", Value: "262144"},
 	{Scope: ScopeGlobal, Name: "relay_log_info_repository", Value: "FILE"},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLLogBin, Value: "1"},
-	{Scope: ScopeGlobal, Name: SuperReadOnly, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLLogBin, Value: "1", Type: TypeBool},
+	{Scope: ScopeGlobal, Name: SuperReadOnly, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_delayed_threads", Value: "20"},
 	{Scope: ScopeNone, Name: "protocol_version", Value: "10"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "new", Value: "OFF"},
@@ -222,7 +231,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "optimizer_trace_offset", Value: "-1"},
 	{Scope: ScopeGlobal, Name: InnodbBufferPoolDumpAtShutdown, Value: "0"},
 	{Scope: ScopeGlobal | ScopeSession, Name: SQLNotes, Value: "1"},
-	{Scope: ScopeGlobal, Name: InnodbCmpPerIndexEnabled, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbCmpPerIndexEnabled, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal, Name: "innodb_ft_server_stopword_table", Value: ""},
 	{Scope: ScopeNone, Name: "performance_schema_max_file_instances", Value: "7693"},
 	{Scope: ScopeNone, Name: "log_output", Value: "FILE"},
@@ -232,15 +241,15 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "innodb_log_write_ahead_size", Value: ""},
 	{Scope: ScopeNone, Name: "innodb_log_group_home_dir", Value: "./"},
 	{Scope: ScopeNone, Name: "performance_schema_events_statements_history_size", Value: "10"},
-	{Scope: ScopeGlobal, Name: GeneralLog, Value: "0"},
+	{Scope: ScopeGlobal, Name: GeneralLog, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "validate_password_dictionary_file", Value: ""},
-	{Scope: ScopeGlobal, Name: BinlogOrderCommits, Value: "1"},
+	{Scope: ScopeGlobal, Name: BinlogOrderCommits, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "key_cache_division_limit", Value: "100"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_insert_delayed_threads", Value: "20"},
 	{Scope: ScopeNone, Name: "performance_schema_session_connect_attrs_size", Value: "512"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "time_zone", Value: "SYSTEM"},
 	{Scope: ScopeGlobal, Name: "innodb_max_dirty_pages_pct", Value: "75"},
-	{Scope: ScopeGlobal, Name: InnodbFilePerTable, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbFilePerTable, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal, Name: InnodbLogCompressedPages, Value: "1"},
 	{Scope: ScopeNone, Name: "skip_networking", Value: "0"},
 	{Scope: ScopeGlobal, Name: "innodb_monitor_reset", Value: ""},
@@ -252,7 +261,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "ssl_cipher", Value: ""},
 	{Scope: ScopeNone, Name: "tls_version", Value: "TLSv1,TLSv1.1,TLSv1.2"},
 	{Scope: ScopeNone, Name: "system_time_zone", Value: "CST"},
-	{Scope: ScopeGlobal, Name: InnodbPrintAllDeadlocks, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbPrintAllDeadlocks, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeNone, Name: "innodb_autoinc_lock_mode", Value: "1"},
 	{Scope: ScopeGlobal, Name: "key_buffer_size", Value: "8388608"},
 	{Scope: ScopeGlobal | ScopeSession, Name: ForeignKeyChecks, Value: "OFF"},
@@ -263,15 +272,15 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "innodb_file_format_max", Value: "Antelope"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "debug", Value: ""},
 	{Scope: ScopeGlobal, Name: "log_warnings", Value: "1"},
-	{Scope: ScopeGlobal, Name: OfflineMode, Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: InnodbStrictMode, Value: "1"},
+	{Scope: ScopeGlobal, Name: OfflineMode, Value: "0", Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: InnodbStrictMode, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal, Name: "innodb_rollback_segments", Value: "128"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "join_buffer_size", Value: "262144"},
 	{Scope: ScopeNone, Name: "innodb_mirrored_log_groups", Value: "1"},
 	{Scope: ScopeGlobal, Name: "max_binlog_size", Value: "1073741824"},
 	{Scope: ScopeGlobal, Name: "concurrent_insert", Value: "AUTO"},
-	{Scope: ScopeGlobal, Name: InnodbAdaptiveHashIndex, Value: "1"},
-	{Scope: ScopeGlobal, Name: InnodbFtEnableStopword, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbAdaptiveHashIndex, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
+	{Scope: ScopeGlobal, Name: InnodbFtEnableStopword, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal, Name: "general_log_file", Value: "/usr/local/mysql/data/localhost.log"},
 	{Scope: ScopeGlobal | ScopeSession, Name: InnodbSupportXA, Value: "1"},
 	{Scope: ScopeGlobal, Name: "innodb_compression_level", Value: "6"},
@@ -281,7 +290,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: BlockEncryptionMode, Value: "aes-128-ecb"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_length_for_sort_data", Value: "1024"},
 	{Scope: ScopeNone, Name: "character_set_system", Value: "utf8"},
-	{Scope: ScopeGlobal | ScopeSession, Name: InteractiveTimeout, Value: "28800"},
+	{Scope: ScopeGlobal | ScopeSession, Name: InteractiveTimeout, Value: "28800", Type: TypeUnsigned, MinValue: 1, MaxValue: secondsPerYear, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal, Name: InnodbOptimizeFullTextOnly, Value: "0"},
 	{Scope: ScopeNone, Name: "character_sets_dir", Value: "/usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/"},
 	{Scope: ScopeGlobal | ScopeSession, Name: QueryCacheType, Value: "OFF"},
@@ -292,17 +301,17 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "thread_concurrency", Value: "10"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "query_prealloc_size", Value: "8192"},
 	{Scope: ScopeNone, Name: "relay_log_space_limit", Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: MaxUserConnections, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: MaxUserConnections, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 4294967295, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "performance_schema_max_thread_classes", Value: "50"},
 	{Scope: ScopeGlobal, Name: "innodb_api_trx_level", Value: "0"},
 	{Scope: ScopeNone, Name: "disconnect_on_expired_password", Value: "1"},
 	{Scope: ScopeNone, Name: "performance_schema_max_file_classes", Value: "50"},
 	{Scope: ScopeGlobal, Name: "expire_logs_days", Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: BinlogRowQueryLogEvents, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: BinlogRowQueryLogEvents, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "default_password_lifetime", Value: ""},
 	{Scope: ScopeNone, Name: "pid_file", Value: "/usr/local/mysql/data/localhost.pid"},
 	{Scope: ScopeNone, Name: "innodb_undo_tablespaces", Value: "0"},
-	{Scope: ScopeGlobal, Name: InnodbStatusOutputLocks, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbStatusOutputLocks, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeNone, Name: "performance_schema_accounts_size", Value: "100"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_error_count", Value: "64"},
 	{Scope: ScopeGlobal, Name: "max_write_lock_count", Value: "18446744073709551615"},
@@ -313,25 +322,25 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "innodb_open_files", Value: "2000"},
 	{Scope: ScopeGlobal, Name: "innodb_spin_wait_delay", Value: "6"},
 	{Scope: ScopeGlobal, Name: "thread_cache_size", Value: "9"},
-	{Scope: ScopeGlobal, Name: LogSlowAdminStatements, Value: "0"},
+	{Scope: ScopeGlobal, Name: LogSlowAdminStatements, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "innodb_checksums", Value: "ON"},
 	{Scope: ScopeNone, Name: "hostname", Value: ServerHostname},
 	{Scope: ScopeGlobal | ScopeSession, Name: "auto_increment_offset", Value: "1"},
 	{Scope: ScopeNone, Name: "ft_stopword_file", Value: "(built-in)"},
 	{Scope: ScopeGlobal, Name: "innodb_max_dirty_pages_pct_lwm", Value: "0"},
-	{Scope: ScopeGlobal, Name: LogQueriesNotUsingIndexes, Value: "0"},
+	{Scope: ScopeGlobal, Name: LogQueriesNotUsingIndexes, Value: "0", Type: TypeBool},
 	{Scope: ScopeSession, Name: "timestamp", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: QueryCacheWlockInvalidate, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: QueryCacheWlockInvalidate, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "sql_buffer_result", Value: "OFF"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "character_set_filesystem", Value: "binary"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "collation_database", Value: mysql.DefaultCollationName},
-	{Scope: ScopeGlobal | ScopeSession, Name: AutoIncrementIncrement, Value: strconv.FormatInt(DefAutoIncrementIncrement, 10)},
-	{Scope: ScopeGlobal | ScopeSession, Name: AutoIncrementOffset, Value: strconv.FormatInt(DefAutoIncrementOffset, 10)},
+	{Scope: ScopeGlobal | ScopeSession, Name: AutoIncrementIncrement, Value: strconv.FormatInt(DefAutoIncrementIncrement, 10), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint16, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: AutoIncrementOffset, Value: strconv.FormatInt(DefAutoIncrementOffset, 10), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint16, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_heap_table_size", Value: "16777216"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "div_precision_increment", Value: "4"},
 	{Scope: ScopeGlobal, Name: "innodb_lru_scan_depth", Value: "1024"},
 	{Scope: ScopeGlobal, Name: "innodb_purge_rseg_truncate_frequency", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLAutoIsNull, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLAutoIsNull, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "innodb_api_enable_binlog", Value: "0"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "innodb_ft_user_stopword_table", Value: ""},
 	{Scope: ScopeNone, Name: "server_id_bits", Value: "32"},
@@ -347,19 +356,19 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "innodb_purge_batch_size", Value: "300"},
 	{Scope: ScopeNone, Name: "have_profiling", Value: "NO"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "character_set_client", Value: mysql.DefaultCharset},
-	{Scope: ScopeGlobal, Name: InnodbBufferPoolDumpNow, Value: "0"},
-	{Scope: ScopeGlobal, Name: RelayLogPurge, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbBufferPoolDumpNow, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
+	{Scope: ScopeGlobal, Name: RelayLogPurge, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "ndb_distribution", Value: ""},
 	{Scope: ScopeGlobal, Name: "myisam_data_pointer_size", Value: "6"},
 	{Scope: ScopeGlobal, Name: "ndb_optimization_delay", Value: ""},
 	{Scope: ScopeGlobal, Name: "innodb_ft_num_word_optimize", Value: "2000"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_join_size", Value: "18446744073709551615"},
-	{Scope: ScopeNone, Name: CoreFile, Value: "0"},
+	{Scope: ScopeNone, Name: CoreFile, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_seeks_for_key", Value: "18446744073709551615"},
 	{Scope: ScopeNone, Name: "innodb_log_buffer_size", Value: "8388608"},
 	{Scope: ScopeGlobal, Name: "delayed_insert_timeout", Value: "300"},
 	{Scope: ScopeGlobal, Name: "max_relay_log_size", Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: MaxSortLength, Value: "1024"},
+	{Scope: ScopeGlobal | ScopeSession, Name: MaxSortLength, Value: "1024", Type: TypeUnsigned, MinValue: 4, MaxValue: 8388608, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "metadata_locks_hash_instances", Value: "8"},
 	{Scope: ScopeGlobal, Name: "ndb_eventbuffer_free_percent", Value: ""},
 	{Scope: ScopeNone, Name: "large_files_support", Value: "1"},
@@ -379,16 +388,16 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "innodb_api_disable_rowlock", Value: "0"},
 	{Scope: ScopeGlobal, Name: "innodb_adaptive_flushing_lwm", Value: "10"},
 	{Scope: ScopeNone, Name: "innodb_log_files_in_group", Value: "2"},
-	{Scope: ScopeGlobal, Name: InnodbBufferPoolLoadNow, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbBufferPoolLoadNow, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeNone, Name: "performance_schema_max_rwlock_classes", Value: "40"},
 	{Scope: ScopeNone, Name: "binlog_gtid_simple_recovery", Value: "1"},
 	{Scope: ScopeNone, Name: Port, Value: "4000"},
 	{Scope: ScopeNone, Name: "performance_schema_digests_size", Value: "10000"},
-	{Scope: ScopeGlobal | ScopeSession, Name: Profiling, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: Profiling, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "lower_case_table_names", Value: "2"},
 	{Scope: ScopeSession, Name: "rand_seed1", Value: ""},
 	{Scope: ScopeGlobal, Name: "sha256_password_proxy_users", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLQuoteShowCreate, Value: "1"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLQuoteShowCreate, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "binlogging_impossible_mode", Value: "IGNORE_ERROR"},
 	{Scope: ScopeGlobal | ScopeSession, Name: QueryCacheSize, Value: "1048576"},
 	{Scope: ScopeGlobal, Name: "innodb_stats_transient_sample_pages", Value: "8"},
@@ -414,9 +423,9 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: InnodbStatsAutoRecalc, Value: "1"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "lc_messages", Value: "en_US"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "bulk_insert_buffer_size", Value: "8388608"},
-	{Scope: ScopeGlobal | ScopeSession, Name: BinlogDirectNonTransactionalUpdates, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: BinlogDirectNonTransactionalUpdates, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "innodb_change_buffering", Value: "all"},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLBigSelects, Value: "1"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLBigSelects, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: CharacterSetResults, Value: mysql.DefaultCharset},
 	{Scope: ScopeGlobal, Name: "innodb_max_purge_lag_delay", Value: "0"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "session_track_schema", Value: ""},
@@ -427,7 +436,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "read_rnd_buffer_size", Value: "262144"},
 	{Scope: ScopeNone, Name: "version_comment", Value: "TiDB Server (Apache License 2.0) " + versioninfo.TiDBEdition + " Edition, MySQL 5.7 compatible"},
 	{Scope: ScopeGlobal | ScopeSession, Name: NetWriteTimeout, Value: "60"},
-	{Scope: ScopeGlobal, Name: InnodbBufferPoolLoadAbort, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbBufferPoolLoadAbort, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: TxnIsolation, Value: "REPEATABLE-READ"},
 	{Scope: ScopeGlobal | ScopeSession, Name: TransactionIsolation, Value: "REPEATABLE-READ"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "collation_connection", Value: mysql.DefaultCollationName},
@@ -444,13 +453,13 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "large_pages", Value: "OFF"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "session_track_system_variables", Value: ""},
 	{Scope: ScopeGlobal, Name: "innodb_change_buffer_max_size", Value: "25"},
-	{Scope: ScopeGlobal, Name: LogBinTrustFunctionCreators, Value: "0"},
+	{Scope: ScopeGlobal, Name: LogBinTrustFunctionCreators, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "innodb_write_io_threads", Value: "4"},
 	{Scope: ScopeGlobal, Name: "mysql_native_password_proxy_users", Value: ""},
-	{Scope: ScopeGlobal, Name: serverReadOnly, Value: "0"},
+	{Scope: ScopeGlobal, Name: serverReadOnly, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "large_page_size", Value: "0"},
 	{Scope: ScopeNone, Name: "table_open_cache_instances", Value: "1"},
-	{Scope: ScopeGlobal, Name: InnodbStatsPersistent, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbStatsPersistent, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: "session_track_state_change", Value: ""},
 	{Scope: ScopeNone, Name: "optimizer_switch", Value: "index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,subquery_materialization_cost_based=on,use_index_extensions=on"},
 	{Scope: ScopeGlobal, Name: "delayed_queue_size", Value: "1000"},
@@ -466,7 +475,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "ndb_index_stat_enable", Value: ""},
 	{Scope: ScopeGlobal, Name: "executed_gtids_compression_period", Value: ""},
 	{Scope: ScopeNone, Name: "time_format", Value: "%H:%i:%s"},
-	{Scope: ScopeGlobal | ScopeSession, Name: OldAlterTable, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: OldAlterTable, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "long_query_time", Value: "10.000000"},
 	{Scope: ScopeNone, Name: "innodb_use_native_aio", Value: "0"},
 	{Scope: ScopeGlobal, Name: "log_throttle_queries_not_using_indexes", Value: "0"},
@@ -474,13 +483,13 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "innodb_api_enable_mdl", Value: "0"},
 	{Scope: ScopeGlobal, Name: "binlog_cache_size", Value: "32768"},
 	{Scope: ScopeGlobal, Name: "innodb_compression_pad_pct_max", Value: "50"},
-	{Scope: ScopeGlobal, Name: InnodbCommitConcurrency, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbCommitConcurrency, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 1000, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "ft_min_word_len", Value: "4"},
 	{Scope: ScopeGlobal, Name: EnforceGtidConsistency, Value: "OFF"},
 	{Scope: ScopeGlobal, Name: SecureAuth, Value: "1"},
 	{Scope: ScopeNone, Name: "max_tmp_tables", Value: "32"},
-	{Scope: ScopeGlobal, Name: InnodbRandomReadAhead, Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: UniqueChecks, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbRandomReadAhead, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: UniqueChecks, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "internal_tmp_disk_storage_engine", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "myisam_repair_threads", Value: "1"},
 	{Scope: ScopeGlobal, Name: "ndb_eventbuffer_max_alloc", Value: ""},
@@ -492,14 +501,14 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "lock_wait_timeout", Value: "31536000"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "read_buffer_size", Value: "131072"},
 	{Scope: ScopeNone, Name: "innodb_read_io_threads", Value: "4"},
-	{Scope: ScopeGlobal | ScopeSession, Name: MaxSpRecursionDepth, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: MaxSpRecursionDepth, Value: "0", Type: TypeUnsigned, MinValue: 0, MaxValue: 255, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "ignore_builtin_innodb", Value: "0"},
 	{Scope: ScopeGlobal, Name: "slow_query_log_file", Value: "/usr/local/mysql/data/localhost-slow.log"},
 	{Scope: ScopeGlobal, Name: "innodb_thread_sleep_delay", Value: "10000"},
 	{Scope: ScopeNone, Name: "license", Value: "Apache License 2.0"},
 	{Scope: ScopeGlobal, Name: "innodb_ft_aux_table", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLWarnings, Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: KeepFilesOnCreate, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLWarnings, Value: "0", Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: KeepFilesOnCreate, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "innodb_data_file_path", Value: "ibdata1:12M:autoextend"},
 	{Scope: ScopeNone, Name: "performance_schema_setup_actors_size", Value: "100"},
 	{Scope: ScopeNone, Name: "innodb_additional_mem_pool_size", Value: "8388608"},
@@ -510,7 +519,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "performance_schema_max_rwlock_instances", Value: "9102"},
 	{Scope: ScopeGlobal, Name: "table_open_cache", Value: "2000"},
 	{Scope: ScopeNone, Name: "performance_schema_events_stages_history_long_size", Value: "10000"},
-	{Scope: ScopeGlobal | ScopeSession, Name: AutoCommit, Value: "1"},
+	{Scope: ScopeGlobal | ScopeSession, Name: AutoCommit, Value: "1", Type: TypeBool},
 	{Scope: ScopeSession, Name: "insert_id", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "default_tmp_storage_engine", Value: "InnoDB"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "optimizer_search_depth", Value: "62"},
@@ -533,7 +542,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeSession, Name: "innodb_create_intrinsic", Value: ""},
 	{Scope: ScopeGlobal, Name: "gtid_executed_compression_period", Value: ""},
 	{Scope: ScopeGlobal, Name: "ndb_log_empty_epochs", Value: ""},
-	{Scope: ScopeGlobal, Name: MaxPreparedStmtCount, Value: strconv.FormatInt(DefMaxPreparedStmtCount, 10)},
+	{Scope: ScopeGlobal, Name: MaxPreparedStmtCount, Value: strconv.FormatInt(DefMaxPreparedStmtCount, 10), Type: TypeInt, MinValue: -1, MaxValue: 1048576, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "have_geometry", Value: "YES"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "optimizer_trace_max_mem_size", Value: "16384"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "net_retry_count", Value: "10"},
@@ -547,12 +556,12 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "completion_type", Value: "NO_CHAIN"},
 	{Scope: ScopeGlobal, Name: "binlog_checksum", Value: "CRC32"},
 	{Scope: ScopeNone, Name: "report_port", Value: "3306"},
-	{Scope: ScopeGlobal | ScopeSession, Name: ShowOldTemporals, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: ShowOldTemporals, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "query_cache_limit", Value: "1048576"},
 	{Scope: ScopeGlobal, Name: "innodb_buffer_pool_size", Value: "134217728"},
-	{Scope: ScopeGlobal, Name: InnodbAdaptiveFlushing, Value: "1"},
+	{Scope: ScopeGlobal, Name: InnodbAdaptiveFlushing, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeNone, Name: "datadir", Value: "/usr/local/mysql/data/"},
-	{Scope: ScopeGlobal | ScopeSession, Name: WaitTimeout, Value: strconv.FormatInt(DefWaitTimeout, 10)},
+	{Scope: ScopeGlobal | ScopeSession, Name: WaitTimeout, Value: strconv.FormatInt(DefWaitTimeout, 10), Type: TypeUnsigned, MinValue: 0, MaxValue: 31536000, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal, Name: "innodb_monitor_enable", Value: ""},
 	{Scope: ScopeNone, Name: "date_format", Value: "%Y-%m-%d"},
 	{Scope: ScopeGlobal, Name: "innodb_buffer_pool_filename", Value: "ib_buffer_pool"},
@@ -566,14 +575,14 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeNone, Name: "basedir", Value: "/usr/local/mysql"},
 	{Scope: ScopeGlobal, Name: "innodb_old_blocks_time", Value: "1000"},
 	{Scope: ScopeGlobal, Name: "innodb_stats_method", Value: "nulls_equal"},
-	{Scope: ScopeGlobal | ScopeSession, Name: InnodbLockWaitTimeout, Value: strconv.FormatInt(DefInnodbLockWaitTimeout, 10)},
-	{Scope: ScopeGlobal, Name: LocalInFile, Value: "1"},
+	{Scope: ScopeGlobal | ScopeSession, Name: InnodbLockWaitTimeout, Value: strconv.FormatInt(DefInnodbLockWaitTimeout, 10), Type: TypeUnsigned, MinValue: 1, MaxValue: 1073741824, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal, Name: LocalInFile, Value: "1", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "myisam_stats_method", Value: "nulls_unequal"},
 	{Scope: ScopeNone, Name: "version_compile_os", Value: "osx10.8"},
 	{Scope: ScopeNone, Name: "relay_log_recovery", Value: "0"},
 	{Scope: ScopeNone, Name: "old", Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: InnodbTableLocks, Value: "1"},
-	{Scope: ScopeNone, Name: PerformanceSchema, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: InnodbTableLocks, Value: "1", Type: TypeBool, AutoConvertNegativeBool: true},
+	{Scope: ScopeNone, Name: PerformanceSchema, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "myisam_recover_options", Value: "OFF"},
 	{Scope: ScopeGlobal | ScopeSession, Name: NetBufferLength, Value: "16384"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "binlog_row_image", Value: "FULL"},
@@ -582,7 +591,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "myisam_max_sort_file_size", Value: "9223372036853727232"},
 	{Scope: ScopeNone, Name: "back_log", Value: "80"},
 	{Scope: ScopeNone, Name: "lower_case_file_system", Value: "1"},
-	{Scope: ScopeGlobal | ScopeSession, Name: GroupConcatMaxLen, Value: "1024"},
+	{Scope: ScopeGlobal | ScopeSession, Name: GroupConcatMaxLen, Value: "1024", AutoConvertOutOfRange: true},
 	{Scope: ScopeSession, Name: "pseudo_thread_id", Value: ""},
 	{Scope: ScopeNone, Name: "socket", Value: "/tmp/myssock"},
 	{Scope: ScopeNone, Name: "have_dynamic_loading", Value: "YES"},
@@ -590,11 +599,11 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "innodb_undo_logs", Value: "128"},
 	{Scope: ScopeNone, Name: "performance_schema_max_cond_instances", Value: "3504"},
 	{Scope: ScopeGlobal, Name: "delayed_insert_limit", Value: "100"},
-	{Scope: ScopeGlobal, Name: Flush, Value: "0"},
+	{Scope: ScopeGlobal, Name: Flush, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: "eq_range_index_dive_limit", Value: "10"},
 	{Scope: ScopeNone, Name: "performance_schema_events_stages_history_size", Value: "10"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "character_set_connection", Value: mysql.DefaultCharset},
-	{Scope: ScopeGlobal, Name: MyISAMUseMmap, Value: "0"},
+	{Scope: ScopeGlobal, Name: MyISAMUseMmap, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeGlobal | ScopeSession, Name: "ndb_join_pushdown", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: CharacterSetServer, Value: mysql.DefaultCharset},
 	{Scope: ScopeGlobal, Name: "validate_password_special_char_count", Value: "1"},
@@ -602,27 +611,27 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: "ndbinfo_show_hidden", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "net_read_timeout", Value: "30"},
 	{Scope: ScopeNone, Name: "innodb_page_size", Value: "16384"},
-	{Scope: ScopeGlobal | ScopeSession, Name: MaxAllowedPacket, Value: "67108864"},
+	{Scope: ScopeGlobal | ScopeSession, Name: MaxAllowedPacket, Value: "67108864", Type: TypeUnsigned, MinValue: 1024, MaxValue: MaxOfMaxAllowedPacket, AutoConvertOutOfRange: true},
 	{Scope: ScopeNone, Name: "innodb_log_file_size", Value: "50331648"},
 	{Scope: ScopeGlobal, Name: "sync_relay_log_info", Value: "10000"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "optimizer_trace_limit", Value: "1"},
 	{Scope: ScopeNone, Name: "innodb_ft_max_token_size", Value: "84"},
-	{Scope: ScopeGlobal, Name: "validate_password_length", Value: "8"},
+	{Scope: ScopeGlobal, Name: ValidatePasswordLength, Value: "8", Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64, AutoConvertOutOfRange: true},
 	{Scope: ScopeGlobal, Name: "ndb_log_binlog_index", Value: ""},
 	{Scope: ScopeGlobal, Name: "innodb_api_bk_commit_interval", Value: "5"},
 	{Scope: ScopeNone, Name: "innodb_undo_directory", Value: "."},
 	{Scope: ScopeNone, Name: "bind_address", Value: "*"},
 	{Scope: ScopeGlobal, Name: "innodb_sync_spin_loops", Value: "30"},
-	{Scope: ScopeGlobal | ScopeSession, Name: SQLSafeUpdates, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: SQLSafeUpdates, Value: "0", Type: TypeBool},
 	{Scope: ScopeNone, Name: "tmpdir", Value: "/var/tmp/"},
 	{Scope: ScopeGlobal, Name: "innodb_thread_concurrency", Value: "0"},
 	{Scope: ScopeGlobal, Name: "innodb_buffer_pool_dump_pct", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "lc_time_names", Value: "en_US"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "max_statement_time", Value: ""},
-	{Scope: ScopeGlobal | ScopeSession, Name: EndMakersInJSON, Value: "0"},
-	{Scope: ScopeGlobal, Name: AvoidTemporalUpgrade, Value: "0"},
+	{Scope: ScopeGlobal | ScopeSession, Name: EndMakersInJSON, Value: "0", Type: TypeBool},
+	{Scope: ScopeGlobal, Name: AvoidTemporalUpgrade, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "key_cache_age_threshold", Value: "300"},
-	{Scope: ScopeGlobal, Name: InnodbStatusOutput, Value: "0"},
+	{Scope: ScopeGlobal, Name: InnodbStatusOutput, Value: "0", Type: TypeBool, AutoConvertNegativeBool: true},
 	{Scope: ScopeSession, Name: "identity", Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: "min_examined_row_limit", Value: "0"},
 	{Scope: ScopeGlobal, Name: "sync_frm", Value: "ON"},
@@ -630,24 +639,24 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeSession, Name: WarningCount, Value: "0"},
 	{Scope: ScopeSession, Name: ErrorCount, Value: "0"},
 	{Scope: ScopeGlobal | ScopeSession, Name: "information_schema_stats_expiry", Value: "86400"},
-	{Scope: ScopeGlobal, Name: "thread_pool_size", Value: "16"},
-	{Scope: ScopeGlobal | ScopeSession, Name: WindowingUseHighPrecision, Value: "ON"},
+	{Scope: ScopeGlobal, Name: ThreadPoolSize, Value: "16", Type: TypeUnsigned, MinValue: 1, MaxValue: 64, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: WindowingUseHighPrecision, Value: "ON", Type: TypeBool},
 	/* TiDB specific variables */
 	{Scope: ScopeSession, Name: TiDBSnapshot, Value: ""},
-	{Scope: ScopeSession, Name: TiDBOptAggPushDown, Value: BoolToIntStr(DefOptAggPushDown)},
+	{Scope: ScopeSession, Name: TiDBOptAggPushDown, Value: BoolToIntStr(DefOptAggPushDown), Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptBCJ, Value: BoolToIntStr(DefOptBCJ)},
-	{Scope: ScopeSession, Name: TiDBOptDistinctAggPushDown, Value: BoolToIntStr(config.GetGlobalConfig().Performance.DistinctAggPushDown)},
+	{Scope: ScopeSession, Name: TiDBOptDistinctAggPushDown, Value: BoolToIntStr(config.GetGlobalConfig().Performance.DistinctAggPushDown), Type: TypeBool},
 	{Scope: ScopeSession, Name: TiDBOptWriteRowID, Value: BoolToIntStr(DefOptWriteRowID)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBuildStatsConcurrency, Value: strconv.Itoa(DefBuildStatsConcurrency)},
 	{Scope: ScopeGlobal, Name: TiDBAutoAnalyzeRatio, Value: strconv.FormatFloat(DefAutoAnalyzeRatio, 'f', -1, 64)},
 	{Scope: ScopeGlobal, Name: TiDBAutoAnalyzeStartTime, Value: DefAutoAnalyzeStartTime},
 	{Scope: ScopeGlobal, Name: TiDBAutoAnalyzeEndTime, Value: DefAutoAnalyzeEndTime},
 	{Scope: ScopeSession, Name: TiDBChecksumTableConcurrency, Value: strconv.Itoa(DefChecksumTableConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBExecutorConcurrency, Value: strconv.Itoa(DefExecutorConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDistSQLScanConcurrency, Value: strconv.Itoa(DefDistSQLScanConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptInSubqToJoinAndAgg, Value: BoolToIntStr(DefOptInSubqToJoinAndAgg)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBExecutorConcurrency, Value: strconv.Itoa(DefExecutorConcurrency), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDistSQLScanConcurrency, Value: strconv.Itoa(DefDistSQLScanConcurrency), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptInSubqToJoinAndAgg, Value: BoolToIntStr(DefOptInSubqToJoinAndAgg), Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptCorrelationThreshold, Value: strconv.FormatFloat(DefOptCorrelationThreshold, 'f', -1, 64)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptCorrelationExpFactor, Value: strconv.Itoa(DefOptCorrelationExpFactor)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptCorrelationExpFactor, Value: strconv.Itoa(DefOptCorrelationExpFactor), Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptCPUFactor, Value: strconv.FormatFloat(DefOptCPUFactor, 'f', -1, 64)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptTiFlashConcurrencyFactor, Value: strconv.FormatFloat(DefOptTiFlashConcurrencyFactor, 'f', -1, 64)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptCopCPUFactor, Value: strconv.FormatFloat(DefOptCopCPUFactor, 'f', -1, 64)},
@@ -658,77 +667,77 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptMemoryFactor, Value: strconv.FormatFloat(DefOptMemoryFactor, 'f', -1, 64)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptDiskFactor, Value: strconv.FormatFloat(DefOptDiskFactor, 'f', -1, 64)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptConcurrencyFactor, Value: strconv.FormatFloat(DefOptConcurrencyFactor, 'f', -1, 64)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexJoinBatchSize, Value: strconv.Itoa(DefIndexJoinBatchSize)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexLookupSize, Value: strconv.Itoa(DefIndexLookupSize)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexJoinBatchSize, Value: strconv.Itoa(DefIndexJoinBatchSize), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexLookupSize, Value: strconv.Itoa(DefIndexLookupSize), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexLookupConcurrency, Value: strconv.Itoa(DefIndexLookupConcurrency)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexLookupJoinConcurrency, Value: strconv.Itoa(DefIndexLookupJoinConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexSerialScanConcurrency, Value: strconv.Itoa(DefIndexSerialScanConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipUTF8Check, Value: BoolToIntStr(DefSkipUTF8Check)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipASCIICheck, Value: BoolToIntStr(DefSkipASCIICheck)},
-	{Scope: ScopeSession, Name: TiDBBatchInsert, Value: BoolToIntStr(DefBatchInsert)},
-	{Scope: ScopeSession, Name: TiDBBatchDelete, Value: BoolToIntStr(DefBatchDelete)},
-	{Scope: ScopeSession, Name: TiDBBatchCommit, Value: BoolToIntStr(DefBatchCommit)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDMLBatchSize, Value: strconv.Itoa(DefDMLBatchSize)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBIndexSerialScanConcurrency, Value: strconv.Itoa(DefIndexSerialScanConcurrency), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipUTF8Check, Value: BoolToIntStr(DefSkipUTF8Check), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipASCIICheck, Value: BoolToIntStr(DefSkipASCIICheck), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBBatchInsert, Value: BoolToIntStr(DefBatchInsert), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBBatchDelete, Value: BoolToIntStr(DefBatchDelete), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBBatchCommit, Value: BoolToIntStr(DefBatchCommit), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDMLBatchSize, Value: strconv.Itoa(DefDMLBatchSize), Type: TypeUnsigned, MinValue: 0, MaxValue: math.MaxUint64},
 	{Scope: ScopeSession, Name: TiDBCurrentTS, Value: strconv.Itoa(DefCurretTS)},
 	{Scope: ScopeSession, Name: TiDBLastTxnInfo, Value: strconv.Itoa(DefCurretTS)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBMaxChunkSize, Value: strconv.Itoa(DefMaxChunkSize)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBAllowBatchCop, Value: strconv.Itoa(DefTiDBAllowBatchCop)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBInitChunkSize, Value: strconv.Itoa(DefInitChunkSize)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableCascadesPlanner, Value: "0"},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableIndexMerge, Value: "0"},
-	{Scope: ScopeSession, Name: TIDBMemQuotaQuery, Value: strconv.FormatInt(config.GetGlobalConfig().MemQuotaQuery, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaHashJoin, Value: strconv.FormatInt(DefTiDBMemQuotaHashJoin, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaMergeJoin, Value: strconv.FormatInt(DefTiDBMemQuotaMergeJoin, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaSort, Value: strconv.FormatInt(DefTiDBMemQuotaSort, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaTopn, Value: strconv.FormatInt(DefTiDBMemQuotaTopn, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaIndexLookupReader, Value: strconv.FormatInt(DefTiDBMemQuotaIndexLookupReader, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaIndexLookupJoin, Value: strconv.FormatInt(DefTiDBMemQuotaIndexLookupJoin, 10)},
-	{Scope: ScopeSession, Name: TIDBMemQuotaNestedLoopApply, Value: strconv.FormatInt(DefTiDBMemQuotaNestedLoopApply, 10)},
-	{Scope: ScopeSession, Name: TiDBEnableStreaming, Value: "0"},
-	{Scope: ScopeSession, Name: TiDBEnableChunkRPC, Value: "1"},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableCascadesPlanner, Value: "0", Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableIndexMerge, Value: "0", Type: TypeBool},
+	{Scope: ScopeSession, Name: TIDBMemQuotaQuery, Value: strconv.FormatInt(config.GetGlobalConfig().MemQuotaQuery, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaHashJoin, Value: strconv.FormatInt(DefTiDBMemQuotaHashJoin, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaMergeJoin, Value: strconv.FormatInt(DefTiDBMemQuotaMergeJoin, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaSort, Value: strconv.FormatInt(DefTiDBMemQuotaSort, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaTopn, Value: strconv.FormatInt(DefTiDBMemQuotaTopn, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaIndexLookupReader, Value: strconv.FormatInt(DefTiDBMemQuotaIndexLookupReader, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaIndexLookupJoin, Value: strconv.FormatInt(DefTiDBMemQuotaIndexLookupJoin, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TIDBMemQuotaNestedLoopApply, Value: strconv.FormatInt(DefTiDBMemQuotaNestedLoopApply, 10), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TiDBEnableStreaming, Value: "0", Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBEnableChunkRPC, Value: "1", Type: TypeBool},
 	{Scope: ScopeSession, Name: TxnIsolationOneShot, Value: ""},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableTablePartition, Value: "on"},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBHashJoinConcurrency, Value: strconv.Itoa(DefTiDBHashJoinConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBProjectionConcurrency, Value: strconv.Itoa(DefTiDBProjectionConcurrency)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBProjectionConcurrency, Value: strconv.Itoa(DefTiDBProjectionConcurrency), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBHashAggPartialConcurrency, Value: strconv.Itoa(DefTiDBHashAggPartialConcurrency)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBHashAggFinalConcurrency, Value: strconv.Itoa(DefTiDBHashAggFinalConcurrency)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBWindowConcurrency, Value: strconv.Itoa(DefTiDBWindowConcurrency)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableParallelApply, Value: BoolToIntStr(DefTiDBEnableParallelApply)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBackoffLockFast, Value: strconv.Itoa(kv.DefBackoffLockFast)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBackOffWeight, Value: strconv.Itoa(kv.DefBackOffWeight)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBRetryLimit, Value: strconv.Itoa(DefTiDBRetryLimit)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDisableTxnAutoRetry, Value: BoolToIntStr(DefTiDBDisableTxnAutoRetry)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBConstraintCheckInPlace, Value: BoolToIntStr(DefTiDBConstraintCheckInPlace)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableParallelApply, Value: BoolToIntStr(DefTiDBEnableParallelApply), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBackoffLockFast, Value: strconv.Itoa(kv.DefBackoffLockFast), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBackOffWeight, Value: strconv.Itoa(kv.DefBackOffWeight), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBRetryLimit, Value: strconv.Itoa(DefTiDBRetryLimit), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBDisableTxnAutoRetry, Value: BoolToIntStr(DefTiDBDisableTxnAutoRetry), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBConstraintCheckInPlace, Value: BoolToIntStr(DefTiDBConstraintCheckInPlace), Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBTxnMode, Value: DefTiDBTxnMode},
 	{Scope: ScopeGlobal, Name: TiDBRowFormatVersion, Value: strconv.Itoa(DefTiDBRowFormatV1)},
-	{Scope: ScopeSession, Name: TiDBOptimizerSelectivityLevel, Value: strconv.Itoa(DefTiDBOptimizerSelectivityLevel)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableWindowFunction, Value: BoolToIntStr(DefEnableWindowFunction)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableVectorizedExpression, Value: BoolToIntStr(DefEnableVectorizedExpression)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableFastAnalyze, Value: BoolToIntStr(DefTiDBUseFastAnalyze)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipIsolationLevelCheck, Value: BoolToIntStr(DefTiDBSkipIsolationLevelCheck)},
+	{Scope: ScopeSession, Name: TiDBOptimizerSelectivityLevel, Value: strconv.Itoa(DefTiDBOptimizerSelectivityLevel), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableWindowFunction, Value: BoolToIntStr(DefEnableWindowFunction), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableVectorizedExpression, Value: BoolToIntStr(DefEnableVectorizedExpression), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableFastAnalyze, Value: BoolToIntStr(DefTiDBUseFastAnalyze), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBSkipIsolationLevelCheck, Value: BoolToIntStr(DefTiDBSkipIsolationLevelCheck), Type: TypeBool},
 	/* The following variable is defined as session scope but is actually server scope. */
-	{Scope: ScopeSession, Name: TiDBGeneralLog, Value: strconv.Itoa(DefTiDBGeneralLog)},
-	{Scope: ScopeSession, Name: TiDBPProfSQLCPU, Value: strconv.Itoa(DefTiDBPProfSQLCPU)},
+	{Scope: ScopeSession, Name: TiDBGeneralLog, Value: strconv.Itoa(DefTiDBGeneralLog), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBPProfSQLCPU, Value: strconv.Itoa(DefTiDBPProfSQLCPU), Type: TypeBool},
 	{Scope: ScopeSession, Name: TiDBDDLSlowOprThreshold, Value: strconv.Itoa(DefTiDBDDLSlowOprThreshold)},
 	{Scope: ScopeSession, Name: TiDBConfig, Value: ""},
-	{Scope: ScopeGlobal, Name: TiDBDDLReorgWorkerCount, Value: strconv.Itoa(DefTiDBDDLReorgWorkerCount)},
-	{Scope: ScopeGlobal, Name: TiDBDDLReorgBatchSize, Value: strconv.Itoa(DefTiDBDDLReorgBatchSize)},
-	{Scope: ScopeGlobal, Name: TiDBDDLErrorCountLimit, Value: strconv.Itoa(DefTiDBDDLErrorCountLimit)},
+	{Scope: ScopeGlobal, Name: TiDBDDLReorgWorkerCount, Value: strconv.Itoa(DefTiDBDDLReorgWorkerCount), Type: TypeUnsigned, MinValue: 1, MaxValue: math.MaxUint64},
+	{Scope: ScopeGlobal, Name: TiDBDDLReorgBatchSize, Value: strconv.Itoa(DefTiDBDDLReorgBatchSize), Type: TypeUnsigned, MinValue: int64(MinDDLReorgBatchSize), MaxValue: uint64(MaxDDLReorgBatchSize), AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal, Name: TiDBDDLErrorCountLimit, Value: strconv.Itoa(DefTiDBDDLErrorCountLimit), Type: TypeUnsigned, MinValue: 0, MaxValue: uint64(math.MaxInt64), AutoConvertOutOfRange: true},
 	{Scope: ScopeSession, Name: TiDBDDLReorgPriority, Value: "PRIORITY_LOW"},
-	{Scope: ScopeGlobal, Name: TiDBMaxDeltaSchemaCount, Value: strconv.Itoa(DefTiDBMaxDeltaSchemaCount)},
-	{Scope: ScopeGlobal, Name: TiDBEnableChangeColumnType, Value: BoolToIntStr(DefTiDBChangeColumnType)},
+	{Scope: ScopeGlobal, Name: TiDBMaxDeltaSchemaCount, Value: strconv.Itoa(DefTiDBMaxDeltaSchemaCount), Type: TypeUnsigned, MinValue: 100, MaxValue: 16384, AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal, Name: TiDBEnableChangeColumnType, Value: BoolToIntStr(DefTiDBChangeColumnType), Type: TypeBool},
 	{Scope: ScopeSession, Name: TiDBForcePriority, Value: mysql.Priority2Str[DefTiDBForcePriority]},
-	{Scope: ScopeSession, Name: TiDBEnableRadixJoin, Value: BoolToIntStr(DefTiDBUseRadixJoin)},
+	{Scope: ScopeSession, Name: TiDBEnableRadixJoin, Value: BoolToIntStr(DefTiDBUseRadixJoin), Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBOptJoinReorderThreshold, Value: strconv.Itoa(DefTiDBOptJoinReorderThreshold)},
 	{Scope: ScopeSession, Name: TiDBSlowQueryFile, Value: ""},
-	{Scope: ScopeGlobal, Name: TiDBScatterRegion, Value: BoolToIntStr(DefTiDBScatterRegion)},
-	{Scope: ScopeSession, Name: TiDBWaitSplitRegionFinish, Value: BoolToIntStr(DefTiDBWaitSplitRegionFinish)},
+	{Scope: ScopeGlobal, Name: TiDBScatterRegion, Value: BoolToIntStr(DefTiDBScatterRegion), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBWaitSplitRegionFinish, Value: BoolToIntStr(DefTiDBWaitSplitRegionFinish), Type: TypeBool},
 	{Scope: ScopeSession, Name: TiDBWaitSplitRegionTimeout, Value: strconv.Itoa(DefWaitSplitRegionTimeout)},
-	{Scope: ScopeSession, Name: TiDBLowResolutionTSO, Value: "0"},
-	{Scope: ScopeSession, Name: TiDBExpensiveQueryTimeThreshold, Value: strconv.Itoa(DefTiDBExpensiveQueryTimeThreshold)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableNoopFuncs, Value: BoolToIntStr(DefTiDBEnableNoopFuncs)},
+	{Scope: ScopeSession, Name: TiDBLowResolutionTSO, Value: "0", Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBExpensiveQueryTimeThreshold, Value: strconv.Itoa(DefTiDBExpensiveQueryTimeThreshold), Type: TypeUnsigned, MinValue: int64(MinExpensiveQueryTimeThreshold), MaxValue: uint64(math.MaxInt64), AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableNoopFuncs, Value: BoolToIntStr(DefTiDBEnableNoopFuncs), Type: TypeBool},
 	{Scope: ScopeSession, Name: TiDBReplicaRead, Value: "leader"},
-	{Scope: ScopeSession, Name: TiDBAllowRemoveAutoInc, Value: BoolToIntStr(DefTiDBAllowRemoveAutoInc)},
+	{Scope: ScopeSession, Name: TiDBAllowRemoveAutoInc, Value: BoolToIntStr(DefTiDBAllowRemoveAutoInc), Type: TypeBool},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableStmtSummary, Value: BoolToIntStr(config.GetGlobalConfig().StmtSummary.Enable)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStmtSummaryInternalQuery, Value: BoolToIntStr(config.GetGlobalConfig().StmtSummary.EnableInternalQuery)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStmtSummaryRefreshInterval, Value: strconv.Itoa(config.GetGlobalConfig().StmtSummary.RefreshInterval)},
@@ -736,39 +745,39 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStmtSummaryMaxStmtCount, Value: strconv.FormatUint(uint64(config.GetGlobalConfig().StmtSummary.MaxStmtCount), 10)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStmtSummaryMaxSQLLength, Value: strconv.FormatUint(uint64(config.GetGlobalConfig().StmtSummary.MaxSQLLength), 10)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBCapturePlanBaseline, Value: "off"},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBUsePlanBaselines, Value: boolToOnOff(DefTiDBUsePlanBaselines)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEvolvePlanBaselines, Value: boolToOnOff(DefTiDBEvolvePlanBaselines)},
-	{Scope: ScopeGlobal, Name: TiDBEvolvePlanTaskMaxTime, Value: strconv.Itoa(DefTiDBEvolvePlanTaskMaxTime)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBUsePlanBaselines, Value: boolToOnOff(DefTiDBUsePlanBaselines), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEvolvePlanBaselines, Value: boolToOnOff(DefTiDBEvolvePlanBaselines), Type: TypeBool},
+	{Scope: ScopeGlobal, Name: TiDBEvolvePlanTaskMaxTime, Value: strconv.Itoa(DefTiDBEvolvePlanTaskMaxTime), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
 	{Scope: ScopeGlobal, Name: TiDBEvolvePlanTaskStartTime, Value: DefTiDBEvolvePlanTaskStartTime},
 	{Scope: ScopeGlobal, Name: TiDBEvolvePlanTaskEndTime, Value: DefTiDBEvolvePlanTaskEndTime},
 	{Scope: ScopeSession, Name: TiDBIsolationReadEngines, Value: strings.Join(config.GetGlobalConfig().IsolationRead.Engines, ", ")},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStoreLimit, Value: strconv.FormatInt(atomic.LoadInt64(&config.GetGlobalConfig().TiKVClient.StoreLimit), 10)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBStoreLimit, Value: strconv.FormatInt(atomic.LoadInt64(&config.GetGlobalConfig().TiKVClient.StoreLimit), 10), Type: TypeInt, MinValue: 0, MaxValue: uint64(math.MaxInt64), AutoConvertOutOfRange: true},
 	{Scope: ScopeSession, Name: TiDBMetricSchemaStep, Value: strconv.Itoa(DefTiDBMetricSchemaStep)},
 	{Scope: ScopeSession, Name: TiDBMetricSchemaRangeDuration, Value: strconv.Itoa(DefTiDBMetricSchemaRangeDuration)},
-	{Scope: ScopeSession, Name: TiDBSlowLogThreshold, Value: strconv.Itoa(logutil.DefaultSlowThreshold)},
-	{Scope: ScopeSession, Name: TiDBRecordPlanInSlowLog, Value: strconv.Itoa(logutil.DefaultRecordPlanInSlowLog)},
-	{Scope: ScopeSession, Name: TiDBEnableSlowLog, Value: BoolToIntStr(logutil.DefaultTiDBEnableSlowLog)},
-	{Scope: ScopeSession, Name: TiDBQueryLogMaxLen, Value: strconv.Itoa(logutil.DefaultQueryLogMaxLen)},
-	{Scope: ScopeSession, Name: TiDBCheckMb4ValueInUTF8, Value: BoolToIntStr(config.GetGlobalConfig().CheckMb4ValueInUTF8)},
-	{Scope: ScopeSession, Name: TiDBFoundInPlanCache, Value: BoolToIntStr(DefTiDBFoundInPlanCache)},
-	{Scope: ScopeSession, Name: TiDBEnableCollectExecutionInfo, Value: BoolToIntStr(DefTiDBEnableCollectExecutionInfo)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBAllowAutoRandExplicitInsert, Value: boolToOnOff(DefTiDBAllowAutoRandExplicitInsert)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableClusteredIndex, Value: BoolToIntStr(DefTiDBEnableClusteredIndex)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBPartitionPruneMode, Value: string(StaticOnly)},
+	{Scope: ScopeSession, Name: TiDBSlowLogThreshold, Value: strconv.Itoa(logutil.DefaultSlowThreshold), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TiDBRecordPlanInSlowLog, Value: strconv.Itoa(logutil.DefaultRecordPlanInSlowLog), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBEnableSlowLog, Value: BoolToIntStr(logutil.DefaultTiDBEnableSlowLog), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBQueryLogMaxLen, Value: strconv.Itoa(logutil.DefaultQueryLogMaxLen), Type: TypeInt, MinValue: -1, MaxValue: math.MaxInt64},
+	{Scope: ScopeSession, Name: TiDBCheckMb4ValueInUTF8, Value: BoolToIntStr(config.GetGlobalConfig().CheckMb4ValueInUTF8), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBFoundInPlanCache, Value: BoolToIntStr(DefTiDBFoundInPlanCache), Type: TypeBool},
+	{Scope: ScopeSession, Name: TiDBEnableCollectExecutionInfo, Value: BoolToIntStr(DefTiDBEnableCollectExecutionInfo), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBAllowAutoRandExplicitInsert, Value: boolToOnOff(DefTiDBAllowAutoRandExplicitInsert), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableClusteredIndex, Value: BoolToIntStr(DefTiDBEnableClusteredIndex), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBPartitionPruneMode, Value: string(StaticOnly), Type: TypeStr},
 	{Scope: ScopeGlobal, Name: TiDBSlowLogMasking, Value: BoolToIntStr(DefTiDBSlowLogMasking)},
 	{Scope: ScopeGlobal, Name: TiDBRedactLog, Value: strconv.Itoa(config.DefTiDBRedactLog)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBShardAllocateStep, Value: strconv.Itoa(DefTiDBShardAllocateStep)},
-	{Scope: ScopeGlobal, Name: TiDBEnableTelemetry, Value: BoolToIntStr(DefTiDBEnableTelemetry)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableAmendPessimisticTxn, Value: boolToOnOff(DefTiDBEnableAmendPessimisticTxn)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBShardAllocateStep, Value: strconv.Itoa(DefTiDBShardAllocateStep), Type: TypeInt, MinValue: 1, MaxValue: uint64(math.MaxInt64), AutoConvertOutOfRange: true},
+	{Scope: ScopeGlobal, Name: TiDBEnableTelemetry, Value: BoolToIntStr(DefTiDBEnableTelemetry), Type: TypeBool},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnableAmendPessimisticTxn, Value: boolToOnOff(DefTiDBEnableAmendPessimisticTxn), Type: TypeBool},
 
 	// for compatibility purpose, we should leave them alone.
 	// TODO: Follow the Terminology Updates of MySQL after their changes arrived.
 	// https://mysqlhighavailability.com/mysql-terminology-updates/
-	{Scope: ScopeSession, Name: PseudoSlaveMode, Value: ""},
+	{Scope: ScopeSession, Name: PseudoSlaveMode, Value: "", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "slave_pending_jobs_size_max", Value: "16777216"},
 	{Scope: ScopeGlobal, Name: "slave_transaction_retries", Value: "10"},
 	{Scope: ScopeGlobal, Name: "slave_checkpoint_period", Value: "300"},
-	{Scope: ScopeGlobal, Name: MasterVerifyChecksum, Value: "0"},
+	{Scope: ScopeGlobal, Name: MasterVerifyChecksum, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "rpl_semi_sync_master_trace_level", Value: ""},
 	{Scope: ScopeGlobal, Name: "master_info_repository", Value: "FILE"},
 	{Scope: ScopeGlobal, Name: "rpl_stop_slave_timeout", Value: "31536000"},
@@ -777,7 +786,7 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "init_slave", Value: ""},
 	{Scope: ScopeGlobal, Name: SlaveCompressedProtocol, Value: "0"},
 	{Scope: ScopeGlobal, Name: "rpl_semi_sync_slave_trace_level", Value: ""},
-	{Scope: ScopeGlobal, Name: LogSlowSlaveStatements, Value: "0"},
+	{Scope: ScopeGlobal, Name: LogSlowSlaveStatements, Value: "0", Type: TypeBool},
 	{Scope: ScopeGlobal, Name: "slave_checkpoint_group", Value: "512"},
 	{Scope: ScopeNone, Name: "slave_load_tmpdir", Value: "/var/tmp/"},
 	{Scope: ScopeGlobal, Name: "slave_parallel_type", Value: ""},
@@ -795,8 +804,8 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeGlobal, Name: "slave_max_allowed_packet", Value: "1073741824"},
 	{Scope: ScopeGlobal, Name: "rpl_semi_sync_master_wait_for_slave_count", Value: ""},
 	{Scope: ScopeGlobal, Name: "rpl_semi_sync_master_wait_no_slave", Value: ""},
-	{Scope: ScopeGlobal, Name: "slave_rows_search_algorithms", Value: "TABLE_SCANINDEX_SCAN"},
-	{Scope: ScopeGlobal, Name: SlaveAllowBatching, Value: "0"},
+	{Scope: ScopeGlobal, Name: "slave_rows_search_algorithms", Value: "TABLE_SCAN,INDEX_SCAN"},
+	{Scope: ScopeGlobal, Name: SlaveAllowBatching, Value: "0", Type: TypeBool},
 }
 
 // SynonymsSysVariables is synonyms of system variables.
diff --git a/sessionctx/variable/tidb_vars.go b/sessionctx/variable/tidb_vars.go
index d05fc43b7dd82..a3f890e7ef017 100644
--- a/sessionctx/variable/tidb_vars.go
+++ b/sessionctx/variable/tidb_vars.go
@@ -552,6 +552,7 @@ const (
 	DefTiDBEnableTelemetry             = true
 	DefTiDBEnableParallelApply         = false
 	DefTiDBEnableAmendPessimisticTxn   = true
+	DefTiDBPartitionPruneMode          = "static-only"
 )
 
 // Process global variables.
diff --git a/sessionctx/variable/varsutil.go b/sessionctx/variable/varsutil.go
index cce4606b9c49e..3bf9264e531ee 100644
--- a/sessionctx/variable/varsutil.go
+++ b/sessionctx/variable/varsutil.go
@@ -209,7 +209,7 @@ const epochShiftBits = 18
 func SetSessionSystemVar(vars *SessionVars, name string, value types.Datum) error {
 	sysVar := GetSysVar(name)
 	if sysVar == nil {
-		return ErrUnknownSystemVar
+		return ErrUnknownSystemVar.GenWithStackByArgs(name)
 	}
 	sVal := ""
 	var err error
@@ -247,6 +247,13 @@ func ValidateGetSystemVar(name string, isGlobal bool) error {
 }
 
 func checkUInt64SystemVar(name, value string, min, max uint64, vars *SessionVars) (string, error) {
+	// There are two types of validation behaviors for integer values. The default
+	// is to return an error saying the value is out of range. For MySQL compatibility, some
+	// values prefer convert the value to the min/max and return a warning.
+	sv := GetSysVar(name)
+	if sv != nil && !sv.AutoConvertOutOfRange {
+		return checkUint64SystemVarWithError(name, value, min, max)
+	}
 	if len(value) == 0 {
 		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
 	}
@@ -274,6 +281,13 @@ func checkUInt64SystemVar(name, value string, min, max uint64, vars *SessionVars
 }
 
 func checkInt64SystemVar(name, value string, min, max int64, vars *SessionVars) (string, error) {
+	// There are two types of validation behaviors for integer values. The default
+	// is to return an error saying the value is out of range. For MySQL compatibility, some
+	// values prefer convert the value to the min/max and return a warning.
+	sv := GetSysVar(name)
+	if sv != nil && !sv.AutoConvertOutOfRange {
+		return checkInt64SystemVarWithError(name, value, min, max)
+	}
 	val, err := strconv.ParseInt(value, 10, 64)
 	if err != nil {
 		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
@@ -289,7 +303,57 @@ func checkInt64SystemVar(name, value string, min, max int64, vars *SessionVars)
 	return value, nil
 }
 
+func checkBoolSystemVar(name, value string, vars *SessionVars) (string, error) {
+	if strings.EqualFold(value, "ON") {
+		return "1", nil
+	} else if strings.EqualFold(value, "OFF") {
+		return "0", nil
+	}
+	val, err := strconv.ParseInt(value, 10, 64)
+	if err == nil {
+		// Confusingly, there are two types of conversion rules for integer values.
+		// The default only allows 0 || 1, but a subset of values convert any
+		// negative integer to 1.
+		sv := GetSysVar(name)
+		if !sv.AutoConvertNegativeBool {
+			if val == 0 {
+				return "0", nil
+			} else if val == 1 {
+				return "1", nil
+			}
+		} else {
+			if val == 1 || val < 0 {
+				return "1", nil
+			} else if val == 0 {
+				return "0", nil
+			}
+		}
+	}
+	return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
+}
+
+func checkUint64SystemVarWithError(name, value string, min, max uint64) (string, error) {
+	if len(value) == 0 {
+		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
+	}
+	if value[0] == '-' {
+		// // in strict it expects the error WrongValue, but in non-strict it returns WrongType
+		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
+	}
+	val, err := strconv.ParseUint(value, 10, 64)
+	if err != nil {
+		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
+	}
+	if val < min || val > max {
+		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
+	}
+	return value, nil
+}
+
 func checkInt64SystemVarWithError(name, value string, min, max int64) (string, error) {
+	if len(value) == 0 {
+		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
+	}
 	val, err := strconv.ParseInt(value, 10, 64)
 	if err != nil {
 		return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
@@ -324,17 +388,34 @@ func CheckDeprecationSetSystemVar(s *SessionVars, name string) {
 
 // ValidateSetSystemVar checks if system variable satisfies specific restriction.
 func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope ScopeFlag) (string, error) {
+	sv := GetSysVar(name)
+	// The string "DEFAULT" is a special keyword in MySQL, which restores
+	// the compiled sysvar value. In which case we can skip further validation.
 	if strings.EqualFold(value, "DEFAULT") {
-		if val := GetSysVar(name); val != nil {
-			return val.Value, nil
+		if sv != nil {
+			return sv.Value, nil
 		}
 		return value, ErrUnknownSystemVar.GenWithStackByArgs(name)
 	}
+	// Attempt to provide validation using the SysVar struct.
+	// Eventually the struct should handle all validation
+	var err error
+	if sv != nil {
+		switch sv.Type {
+		case TypeUnsigned:
+			value, err = checkUInt64SystemVar(name, value, uint64(sv.MinValue), sv.MaxValue, vars)
+		case TypeInt:
+			value, err = checkInt64SystemVar(name, value, sv.MinValue, int64(sv.MaxValue), vars)
+		case TypeBool:
+			value, err = checkBoolSystemVar(name, value, vars)
+		}
+		// If there is no error, follow through and handle legacy cases of validation that are not handled by the type.
+		// TODO: Move each of these validations into the SysVar as an anonymous function.
+		if err != nil {
+			return value, err
+		}
+	}
 	switch name {
-	case ConnectTimeout:
-		return checkUInt64SystemVar(name, value, 2, secondsPerYear, vars)
-	case DefaultWeekFormat:
-		return checkUInt64SystemVar(name, value, 0, 7, vars)
 	case DelayKeyWrite:
 		if strings.EqualFold(value, "ON") || value == "1" {
 			return "ON", nil
@@ -344,8 +425,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return "ALL", nil
 		}
 		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-	case FlushTime:
-		return checkUInt64SystemVar(name, value, 0, secondsPerYear, vars)
 	case ForeignKeyChecks:
 		if strings.EqualFold(value, "ON") || value == "1" {
 			// TiDB does not yet support foreign keys.
@@ -366,31 +445,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			maxLen = uint64(math.MaxUint32)
 		}
 		return checkUInt64SystemVar(name, value, 4, maxLen, vars)
-	case InteractiveTimeout:
-		return checkUInt64SystemVar(name, value, 1, secondsPerYear, vars)
-	case InnodbCommitConcurrency:
-		return checkUInt64SystemVar(name, value, 0, 1000, vars)
-	case InnodbFastShutdown:
-		return checkUInt64SystemVar(name, value, 0, 2, vars)
-	case InnodbLockWaitTimeout:
-		return checkUInt64SystemVar(name, value, 1, 1073741824, vars)
-	// See "https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_allowed_packet"
-	case MaxAllowedPacket:
-		return checkUInt64SystemVar(name, value, 1024, MaxOfMaxAllowedPacket, vars)
-	case MaxConnections:
-		return checkUInt64SystemVar(name, value, 1, 100000, vars)
-	case MaxConnectErrors:
-		return checkUInt64SystemVar(name, value, 1, math.MaxUint64, vars)
-	case MaxSortLength:
-		return checkUInt64SystemVar(name, value, 4, 8388608, vars)
-	case MaxSpRecursionDepth:
-		return checkUInt64SystemVar(name, value, 0, 255, vars)
-	case MaxUserConnections:
-		return checkUInt64SystemVar(name, value, 0, 4294967295, vars)
-	case OldPasswords:
-		return checkUInt64SystemVar(name, value, 0, 2, vars)
-	case TiDBMaxDeltaSchemaCount:
-		return checkInt64SystemVar(name, value, 100, 16384, vars)
 	case SessionTrackGtids:
 		if strings.EqualFold(value, "OFF") || value == "0" {
 			return "OFF", nil
@@ -400,30 +454,12 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return "ALL_GTIDS", nil
 		}
 		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-	case SQLSelectLimit:
-		return checkUInt64SystemVar(name, value, 0, math.MaxUint64, vars)
-	case TiDBStoreLimit:
-		return checkInt64SystemVar(name, value, 0, math.MaxInt64, vars)
-	case SyncBinlog:
-		return checkUInt64SystemVar(name, value, 0, 4294967295, vars)
-	case TableDefinitionCache:
-		return checkUInt64SystemVar(name, value, 400, 524288, vars)
-	case TmpTableSize:
-		return checkUInt64SystemVar(name, value, 1024, math.MaxUint64, vars)
-	case WaitTimeout:
-		return checkUInt64SystemVar(name, value, 0, 31536000, vars)
-	case MaxPreparedStmtCount:
-		return checkInt64SystemVar(name, value, -1, 1048576, vars)
-	case AutoIncrementIncrement, AutoIncrementOffset:
-		return checkUInt64SystemVar(name, value, 1, math.MaxUint16, vars)
 	case TimeZone:
 		if strings.EqualFold(value, "SYSTEM") {
 			return "SYSTEM", nil
 		}
 		_, err := parseTimeZone(value)
 		return value, err
-	case ValidatePasswordLength, ValidatePasswordNumberCount:
-		return checkUInt64SystemVar(name, value, 0, math.MaxUint64, vars)
 	case WarningCount, ErrorCount:
 		return value, ErrReadOnly.GenWithStackByArgs(name)
 	case EnforceGtidConsistency:
@@ -461,61 +497,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return value, ErrWrongValueForVar.GenWithStackByArgs("Can't set Broadcast Join to 1 but tidb_allow_batch_cop is 0, please active batch cop at first.")
 		}
 		return value, nil
-	case TiDBSkipUTF8Check, TiDBSkipASCIICheck, TiDBOptAggPushDown,
-		TiDBOptDistinctAggPushDown, TiDBOptInSubqToJoinAndAgg, TiDBEnableFastAnalyze,
-		TiDBBatchInsert, TiDBDisableTxnAutoRetry, TiDBEnableStreaming, TiDBEnableChunkRPC,
-		TiDBBatchDelete, TiDBBatchCommit, TiDBEnableCascadesPlanner, TiDBEnableWindowFunction, TiDBPProfSQLCPU,
-		TiDBLowResolutionTSO, TiDBEnableIndexMerge, TiDBEnableNoopFuncs,
-		TiDBCheckMb4ValueInUTF8, TiDBEnableSlowLog, TiDBRecordPlanInSlowLog,
-		TiDBScatterRegion, TiDBGeneralLog, TiDBConstraintCheckInPlace, TiDBEnableVectorizedExpression,
-		TiDBFoundInPlanCache, TiDBEnableCollectExecutionInfo, TiDBAllowAutoRandExplicitInsert,
-		TiDBEnableClusteredIndex, TiDBEnableTelemetry, TiDBEnableChangeColumnType, TiDBEnableAmendPessimisticTxn:
-		fallthrough
-	case GeneralLog, AvoidTemporalUpgrade, BigTables, CheckProxyUsers, LogBin,
-		CoreFile, EndMakersInJSON, SQLLogBin, OfflineMode, PseudoSlaveMode, LowPriorityUpdates,
-		SkipNameResolve, SQLSafeUpdates, serverReadOnly, SlaveAllowBatching,
-		Flush, PerformanceSchema, LocalInFile, ShowOldTemporals, KeepFilesOnCreate, AutoCommit,
-		SQLWarnings, UniqueChecks, OldAlterTable, LogBinTrustFunctionCreators, SQLBigSelects,
-		BinlogDirectNonTransactionalUpdates, SQLQuoteShowCreate, AutomaticSpPrivileges,
-		RelayLogPurge, SQLAutoIsNull, QueryCacheWlockInvalidate, ValidatePasswordCheckUserName,
-		SuperReadOnly, BinlogOrderCommits, MasterVerifyChecksum, BinlogRowQueryLogEvents, LogSlowSlaveStatements,
-		LogSlowAdminStatements, LogQueriesNotUsingIndexes, Profiling:
-		if strings.EqualFold(value, "ON") {
-			return "1", nil
-		} else if strings.EqualFold(value, "OFF") {
-			return "0", nil
-		}
-		val, err := strconv.ParseInt(value, 10, 64)
-		if err == nil {
-			if val == 0 {
-				return "0", nil
-			} else if val == 1 {
-				return "1", nil
-			}
-		}
-		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-	case MyISAMUseMmap, InnodbTableLocks, InnodbStatusOutput, InnodbAdaptiveFlushing, InnodbRandomReadAhead,
-		InnodbStatsPersistent, InnodbBufferPoolLoadAbort, InnodbBufferPoolLoadNow, InnodbBufferPoolDumpNow,
-		InnodbCmpPerIndexEnabled, InnodbFilePerTable, InnodbPrintAllDeadlocks,
-		InnodbStrictMode, InnodbAdaptiveHashIndex, InnodbFtEnableStopword, InnodbStatusOutputLocks:
-		if strings.EqualFold(value, "ON") {
-			return "1", nil
-		} else if strings.EqualFold(value, "OFF") {
-			return "0", nil
-		}
-		val, err := strconv.ParseInt(value, 10, 64)
-		if err == nil {
-			if val == 1 || val < 0 {
-				return "1", nil
-			} else if val == 0 {
-				return "0", nil
-			}
-		}
-		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-	case MaxExecutionTime:
-		return checkUInt64SystemVar(name, value, 0, math.MaxUint64, vars)
-	case ThreadPoolSize:
-		return checkUInt64SystemVar(name, value, 1, 64, vars)
 	case TiDBEnableTablePartition:
 		switch {
 		case strings.EqualFold(value, "ON") || value == "1":
@@ -526,12 +507,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return "auto", nil
 		}
 		return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-	case TiDBDDLReorgBatchSize:
-		return checkUInt64SystemVar(name, value, uint64(MinDDLReorgBatchSize), uint64(MaxDDLReorgBatchSize), vars)
-	case TiDBDDLErrorCountLimit:
-		return checkUInt64SystemVar(name, value, uint64(0), math.MaxInt64, vars)
-	case TiDBExpensiveQueryTimeThreshold:
-		return checkUInt64SystemVar(name, value, MinExpensiveQueryTimeThreshold, math.MaxInt64, vars)
 	case TiDBIndexLookupConcurrency,
 		TiDBIndexLookupJoinConcurrency,
 		TiDBHashJoinConcurrency,
@@ -546,31 +521,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
 		}
 		return value, nil
-	case TiDBExecutorConcurrency,
-		TiDBDistSQLScanConcurrency,
-		TiDBIndexSerialScanConcurrency,
-		TiDBIndexJoinBatchSize,
-		TiDBIndexLookupSize,
-		TiDBDDLReorgWorkerCount,
-		TiDBBackoffLockFast, TiDBBackOffWeight,
-		TiDBOptimizerSelectivityLevel:
-		v, err := strconv.Atoi(value)
-		if err != nil {
-			return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
-		}
-		if v <= 0 {
-			return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-		}
-		return value, nil
-	case TiDBOptCorrelationExpFactor, TiDBDMLBatchSize:
-		v, err := strconv.Atoi(value)
-		if err != nil {
-			return value, ErrWrongTypeForVar.GenWithStackByArgs(name)
-		}
-		if v < 0 {
-			return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
-		}
-		return value, nil
 	case TiDBOptCorrelationThreshold:
 		v, err := strconv.ParseFloat(value, 64)
 		if err != nil {
@@ -610,24 +560,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 			return value, ErrWrongValueForVar.GenWithStackByArgs(name, value)
 		}
 		return value, nil
-	case TiDBProjectionConcurrency,
-		TIDBMemQuotaQuery,
-		TIDBMemQuotaHashJoin,
-		TIDBMemQuotaMergeJoin,
-		TIDBMemQuotaSort,
-		TIDBMemQuotaTopn,
-		TIDBMemQuotaIndexLookupReader,
-		TIDBMemQuotaIndexLookupJoin,
-		TIDBMemQuotaNestedLoopApply,
-		TiDBRetryLimit,
-		TiDBSlowLogThreshold,
-		TiDBQueryLogMaxLen,
-		TiDBEvolvePlanTaskMaxTime:
-		_, err := strconv.ParseInt(value, 10, 64)
-		if err != nil {
-			return value, ErrWrongValueForVar.GenWithStackByArgs(name)
-		}
-		return value, nil
 	case TiDBAutoAnalyzeStartTime, TiDBAutoAnalyzeEndTime, TiDBEvolvePlanTaskStartTime, TiDBEvolvePlanTaskEndTime:
 		v, err := setDayTime(vars, value)
 		if err != nil {
@@ -812,8 +744,6 @@ func ValidateSetSystemVar(vars *SessionVars, name string, value string, scope Sc
 		if _, err := collate.GetCollationByName(value); err != nil {
 			return value, errors.Trace(err)
 		}
-	case TiDBShardAllocateStep:
-		return checkInt64SystemVar(name, value, 1, math.MaxInt64, vars)
 	}
 	return value, nil
 }
diff --git a/sessionctx/variable/varsutil_test.go b/sessionctx/variable/varsutil_test.go
index 9dbf0443f3a4e..946d12bd86cb8 100644
--- a/sessionctx/variable/varsutil_test.go
+++ b/sessionctx/variable/varsutil_test.go
@@ -466,6 +466,9 @@ func (s *testVarsutilSuite) TestVarsutil(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(val, Equals, "1")
 	c.Assert(v.systems[TiDBEnableChangeColumnType], Equals, "1")
+
+	err = SetSessionSystemVar(v, "UnknownVariable", types.NewStringDatum("on"))
+	c.Assert(err, ErrorMatches, ".*]Unknown system variable 'UnknownVariable'")
 }
 
 func (s *testVarsutilSuite) TestSetOverflowBehave(c *C) {
diff --git a/statistics/handle/ddl.go b/statistics/handle/ddl.go
index 9881ee3b52d94..204f387b9e539 100644
--- a/statistics/handle/ddl.go
+++ b/statistics/handle/ddl.go
@@ -22,6 +22,7 @@ import (
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/parser/terror"
 	"github.com/pingcap/tidb/ddl/util"
+	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/sqlexec"
 )
@@ -30,37 +31,54 @@ import (
 func (h *Handle) HandleDDLEvent(t *util.Event) error {
 	switch t.Tp {
 	case model.ActionCreateTable, model.ActionTruncateTable:
-		ids := getPhysicalIDs(t.TableInfo)
+		ids := h.getInitStateTableIDs(t.TableInfo)
 		for _, id := range ids {
 			if err := h.insertTableStats2KV(t.TableInfo, id); err != nil {
 				return err
 			}
 		}
 	case model.ActionAddColumn, model.ActionAddColumns, model.ActionModifyColumn:
-		ids := getPhysicalIDs(t.TableInfo)
+		ids := h.getInitStateTableIDs(t.TableInfo)
 		for _, id := range ids {
 			if err := h.insertColStats2KV(id, t.ColumnInfos); err != nil {
 				return err
 			}
 		}
 	case model.ActionAddTablePartition, model.ActionTruncateTablePartition:
-		for _, def := range t.PartInfo.Definitions {
-			if err := h.insertTableStats2KV(t.TableInfo, def.ID); err != nil {
-				return err
+		pruneMode := h.CurrentPruneMode()
+		if pruneMode == variable.StaticOnly || pruneMode == variable.StaticButPrepareDynamic {
+			for _, def := range t.PartInfo.Definitions {
+				if err := h.insertTableStats2KV(t.TableInfo, def.ID); err != nil {
+					return err
+				}
 			}
 		}
+		if pruneMode == variable.DynamicOnly || pruneMode == variable.StaticButPrepareDynamic {
+			// TODO: need trigger full analyze
+		}
+	case model.ActionDropTablePartition:
+		pruneMode := h.CurrentPruneMode()
+		if pruneMode == variable.DynamicOnly || pruneMode == variable.StaticButPrepareDynamic {
+			// TODO: need trigger full analyze
+		}
 	}
 	return nil
 }
 
-func getPhysicalIDs(tblInfo *model.TableInfo) []int64 {
+func (h *Handle) getInitStateTableIDs(tblInfo *model.TableInfo) (ids []int64) {
 	pi := tblInfo.GetPartitionInfo()
 	if pi == nil {
 		return []int64{tblInfo.ID}
 	}
-	ids := make([]int64, 0, len(pi.Definitions))
-	for _, def := range pi.Definitions {
-		ids = append(ids, def.ID)
+	ids = make([]int64, 0, len(pi.Definitions)+1)
+	pruneMode := h.CurrentPruneMode()
+	if pruneMode == variable.StaticOnly || pruneMode == variable.StaticButPrepareDynamic {
+		for _, def := range pi.Definitions {
+			ids = append(ids, def.ID)
+		}
+	}
+	if pruneMode == variable.DynamicOnly || pruneMode == variable.StaticButPrepareDynamic {
+		ids = append(ids, tblInfo.ID)
 	}
 	return ids
 }
@@ -143,7 +161,7 @@ func (h *Handle) insertColStats2KV(physicalID int64, colInfos []*model.ColumnInf
 		count := req.GetRow(0).GetInt64(0)
 		sqls := make([]string, 0, len(colInfos))
 		for _, colInfo := range colInfos {
-			value := types.NewDatum(colInfo.OriginDefaultValue)
+			value := types.NewDatum(colInfo.GetOriginDefaultValue())
 			value, err = value.ConvertTo(h.mu.ctx.GetSessionVars().StmtCtx, &colInfo.FieldType)
 			if err != nil {
 				return
diff --git a/statistics/handle/dump.go b/statistics/handle/dump.go
index 18729063b48a9..1ef91f1f4698e 100644
--- a/statistics/handle/dump.go
+++ b/statistics/handle/dump.go
@@ -21,6 +21,7 @@ import (
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/infoschema"
 	"github.com/pingcap/tidb/sessionctx/stmtctx"
+	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/statistics"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/sqlexec"
@@ -114,7 +115,7 @@ func dumpJSONCol(hist *statistics.Histogram, CMSketch *statistics.CMSketch) *jso
 // DumpStatsToJSON dumps statistic to json.
 func (h *Handle) DumpStatsToJSON(dbName string, tableInfo *model.TableInfo, historyStatsExec sqlexec.RestrictedSQLExecutor) (*JSONTable, error) {
 	pi := tableInfo.GetPartitionInfo()
-	if pi == nil {
+	if pi == nil || h.CurrentPruneMode() == variable.DynamicOnly {
 		return h.tableStatsToJSON(dbName, tableInfo, tableInfo.ID, historyStatsExec)
 	}
 	jsonTbl := &JSONTable{
@@ -177,15 +178,12 @@ func (h *Handle) LoadStatsFromJSON(is infoschema.InfoSchema, jsonTbl *JSONTable)
 	}
 	tableInfo := table.Meta()
 	pi := tableInfo.GetPartitionInfo()
-	if pi == nil {
+	if pi == nil || jsonTbl.Partitions == nil {
 		err := h.loadStatsFromJSON(tableInfo, tableInfo.ID, jsonTbl)
 		if err != nil {
 			return errors.Trace(err)
 		}
 	} else {
-		if jsonTbl.Partitions == nil {
-			return errors.New("No partition statistics")
-		}
 		for _, def := range pi.Definitions {
 			tbl := jsonTbl.Partitions[def.Name.L]
 			if tbl == nil {
diff --git a/statistics/handle/handle.go b/statistics/handle/handle.go
index 2eaa839037e17..1322068479a11 100644
--- a/statistics/handle/handle.go
+++ b/statistics/handle/handle.go
@@ -112,7 +112,7 @@ func (h *Handle) Clear() {
 }
 
 // NewHandle creates a Handle for update stats.
-func NewHandle(ctx sessionctx.Context, lease time.Duration) *Handle {
+func NewHandle(ctx sessionctx.Context, lease time.Duration) (*Handle, error) {
 	handle := &Handle{
 		ddlEventCh: make(chan *util.Event, 100),
 		listHead:   &SessionStatsCollector{mapper: make(tableDeltaMap), rateMap: make(errorRateDeltaMap)},
@@ -128,7 +128,11 @@ func NewHandle(ctx sessionctx.Context, lease time.Duration) *Handle {
 	handle.mu.ctx = ctx
 	handle.mu.rateMap = make(errorRateDeltaMap)
 	handle.statsCache.Store(statsCache{tables: make(map[int64]*statistics.Table)})
-	return handle
+	err := handle.RefreshVars()
+	if err != nil {
+		return nil, err
+	}
+	return handle, nil
 }
 
 // Lease returns the stats lease.
@@ -195,7 +199,7 @@ func (h *Handle) Update(is infoschema.InfoSchema) error {
 		tbl, err := h.tableStatsFromStorage(tableInfo, physicalID, false, nil)
 		// Error is not nil may mean that there are some ddl changes on this table, we will not update it.
 		if err != nil {
-			logutil.BgLogger().Debug("error occurred when read table stats", zap.String("table", tableInfo.Name.O), zap.Error(err))
+			logutil.BgLogger().Error("[stats] error occurred when read table stats", zap.String("table", tableInfo.Name.O), zap.Error(err))
 			continue
 		}
 		if tbl == nil {
@@ -393,14 +397,14 @@ func (h *Handle) FlushStats() {
 	for len(h.ddlEventCh) > 0 {
 		e := <-h.ddlEventCh
 		if err := h.HandleDDLEvent(e); err != nil {
-			logutil.BgLogger().Debug("[stats] handle ddl event fail", zap.Error(err))
+			logutil.BgLogger().Error("[stats] handle ddl event fail", zap.Error(err))
 		}
 	}
 	if err := h.DumpStatsDeltaToKV(DumpAll); err != nil {
-		logutil.BgLogger().Debug("[stats] dump stats delta fail", zap.Error(err))
+		logutil.BgLogger().Error("[stats] dump stats delta fail", zap.Error(err))
 	}
 	if err := h.DumpStatsFeedbackToKV(); err != nil {
-		logutil.BgLogger().Debug("[stats] dump stats feedback fail", zap.Error(err))
+		logutil.BgLogger().Error("[stats] dump stats feedback fail", zap.Error(err))
 	}
 }
 
@@ -625,7 +629,7 @@ func (h *Handle) extendedStatsFromStorage(reader *statsReader, table *statistics
 			colIDs := row.GetString(4)
 			err := json.Unmarshal([]byte(colIDs), &item.ColIDs)
 			if err != nil {
-				logutil.BgLogger().Debug("decode column IDs failed", zap.String("column_ids", colIDs), zap.Error(err))
+				logutil.BgLogger().Error("[stats] decode column IDs failed", zap.String("column_ids", colIDs), zap.Error(err))
 				return nil, err
 			}
 			table.ExtendedStats.Stats[key] = item
@@ -833,7 +837,7 @@ func (sr *statsReader) isHistory() bool {
 	return sr.history != nil
 }
 
-func (h *Handle) getStatsReader(history sqlexec.RestrictedSQLExecutor) (*statsReader, error) {
+func (h *Handle) getStatsReader(history sqlexec.RestrictedSQLExecutor) (reader *statsReader, err error) {
 	failpoint.Inject("mockGetStatsReaderFail", func(val failpoint.Value) {
 		if val.(bool) {
 			failpoint.Return(nil, errors.New("gofail genStatsReader error"))
@@ -843,7 +847,16 @@ func (h *Handle) getStatsReader(history sqlexec.RestrictedSQLExecutor) (*statsRe
 		return &statsReader{history: history}, nil
 	}
 	h.mu.Lock()
-	_, err := h.mu.ctx.(sqlexec.SQLExecutor).Execute(context.TODO(), "begin")
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("getStatsReader panic %v", r)
+		}
+		if err != nil {
+			h.mu.Unlock()
+		}
+	}()
+	failpoint.Inject("mockGetStatsReaderPanic", nil)
+	_, err = h.mu.ctx.(sqlexec.SQLExecutor).Execute(context.TODO(), "begin")
 	if err != nil {
 		return nil, err
 	}
diff --git a/statistics/handle/handle_test.go b/statistics/handle/handle_test.go
index 3cc530b47cc70..e5c3d6e573182 100644
--- a/statistics/handle/handle_test.go
+++ b/statistics/handle/handle_test.go
@@ -354,7 +354,8 @@ func (s *testStatsSuite) TestVersion(c *C) {
 	tbl1, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t1"))
 	c.Assert(err, IsNil)
 	tableInfo1 := tbl1.Meta()
-	h := handle.NewHandle(testKit.Se, time.Millisecond)
+	h, err := handle.NewHandle(testKit.Se, time.Millisecond)
+	c.Assert(err, IsNil)
 	unit := oracle.ComposeTS(1, 0)
 	testKit.MustExec("update mysql.stats_meta set version = ? where table_id = ?", 2*unit, tableInfo1.ID)
 
@@ -550,6 +551,13 @@ func (s *testStatsSuite) TestLoadStats(c *C) {
 	err = h.LoadNeededHistograms()
 	c.Assert(err, NotNil)
 	c.Assert(failpoint.Disable("github.com/pingcap/tidb/statistics/handle/mockGetStatsReaderFail"), IsNil)
+
+	c.Assert(failpoint.Enable("github.com/pingcap/tidb/statistics/handle/mockGetStatsReaderPanic", "panic"), IsNil)
+	err = h.LoadNeededHistograms()
+	c.Assert(err, ErrorMatches, ".*getStatsReader panic.*")
+	c.Assert(failpoint.Disable("github.com/pingcap/tidb/statistics/handle/mockGetStatsReaderPanic"), IsNil)
+	err = h.LoadNeededHistograms()
+	c.Assert(err, IsNil)
 }
 
 func newStoreWithBootstrap() (kv.Storage, *domain.Domain, error) {
diff --git a/statistics/handle/update.go b/statistics/handle/update.go
index 28f331761f9fa..38f9b3c70aae2 100644
--- a/statistics/handle/update.go
+++ b/statistics/handle/update.go
@@ -581,10 +581,10 @@ func (h *Handle) handleSingleHistogramUpdate(is infoschema.InfoSchema, rows []ch
 		return nil
 	}
 	var tbl *statistics.Table
-	if table.Meta().GetPartitionInfo() != nil {
-		tbl = h.GetPartitionStats(table.Meta(), physicalTableID)
-	} else {
+	if table.Meta().GetPartitionInfo() == nil || h.CurrentPruneMode() == variable.DynamicOnly {
 		tbl = h.GetTableStats(table.Meta())
+	} else {
+		tbl = h.GetPartitionStats(table.Meta(), physicalTableID)
 	}
 	var cms *statistics.CMSketch
 	var hist *statistics.Histogram
@@ -736,12 +736,12 @@ func (h *Handle) HandleAutoAnalyze(is infoschema.InfoSchema) {
 		logutil.BgLogger().Error("[stats] parse auto analyze period failed", zap.Error(err))
 		return
 	}
+	pruneMode := h.CurrentPruneMode()
 	for _, db := range dbs {
 		tbls := is.SchemaTables(model.NewCIStr(db))
 		for _, tbl := range tbls {
 			tblInfo := tbl.Meta()
 			pi := tblInfo.GetPartitionInfo()
-			pruneMode := h.CurrentPruneMode()
 			if pi == nil || pruneMode == variable.DynamicOnly || pruneMode == variable.StaticButPrepareDynamic {
 				statsTbl := h.GetTableStats(tblInfo)
 				sql := "analyze table `" + db + "`.`" + tblInfo.Name.O + "`"
@@ -751,7 +751,7 @@ func (h *Handle) HandleAutoAnalyze(is infoschema.InfoSchema) {
 				}
 				continue
 			}
-			if h.CurrentPruneMode() == variable.StaticOnly || pruneMode == variable.StaticButPrepareDynamic {
+			if pruneMode == variable.StaticOnly || pruneMode == variable.StaticButPrepareDynamic {
 				for _, def := range pi.Definitions {
 					sql := "analyze table `" + db + "`.`" + tblInfo.Name.O + "`" + " partition `" + def.Name.O + "`"
 					statsTbl := h.GetPartitionStats(tblInfo, def.ID)
diff --git a/statistics/handle/update_test.go b/statistics/handle/update_test.go
index 25c9b933c7854..4c41057699a65 100644
--- a/statistics/handle/update_test.go
+++ b/statistics/handle/update_test.go
@@ -321,51 +321,55 @@ func (s *testStatsSuite) TestTxnWithFailure(c *C) {
 func (s *testStatsSuite) TestUpdatePartition(c *C) {
 	defer cleanEnv(c, s.store, s.do)
 	testKit := testkit.NewTestKit(c, s.store)
+	testKit.MustQuery("select @@tidb_partition_prune_mode").Check(testkit.Rows(string(s.do.StatsHandle().CurrentPruneMode())))
 	testKit.MustExec("use test")
-	testKit.MustExec("drop table if exists t")
-	createTable := `CREATE TABLE t (a int, b char(5)) PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (6),PARTITION p1 VALUES LESS THAN (11))`
-	testKit.MustExec(createTable)
-	do := s.do
-	is := do.InfoSchema()
-	tbl, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
-	c.Assert(err, IsNil)
-	tableInfo := tbl.Meta()
-	h := do.StatsHandle()
-	err = h.HandleDDLEvent(<-h.DDLEventCh())
-	c.Assert(err, IsNil)
-	pi := tableInfo.GetPartitionInfo()
-	c.Assert(len(pi.Definitions), Equals, 2)
-	bColID := tableInfo.Columns[1].ID
+	testkit.WithPruneMode(testKit, variable.StaticOnly, func() {
+		s.do.StatsHandle().RefreshVars()
+		testKit.MustExec("drop table if exists t")
+		createTable := `CREATE TABLE t (a int, b char(5)) PARTITION BY RANGE (a) (PARTITION p0 VALUES LESS THAN (6),PARTITION p1 VALUES LESS THAN (11))`
+		testKit.MustExec(createTable)
+		do := s.do
+		is := do.InfoSchema()
+		tbl, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+		c.Assert(err, IsNil)
+		tableInfo := tbl.Meta()
+		h := do.StatsHandle()
+		err = h.HandleDDLEvent(<-h.DDLEventCh())
+		c.Assert(err, IsNil)
+		pi := tableInfo.GetPartitionInfo()
+		c.Assert(len(pi.Definitions), Equals, 2)
+		bColID := tableInfo.Columns[1].ID
 
-	testKit.MustExec(`insert into t values (1, "a"), (7, "a")`)
-	c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
-	c.Assert(h.Update(is), IsNil)
-	for _, def := range pi.Definitions {
-		statsTbl := h.GetPartitionStats(tableInfo, def.ID)
-		c.Assert(statsTbl.ModifyCount, Equals, int64(1))
-		c.Assert(statsTbl.Count, Equals, int64(1))
-		c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(2))
-	}
+		testKit.MustExec(`insert into t values (1, "a"), (7, "a")`)
+		c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
+		c.Assert(h.Update(is), IsNil)
+		for _, def := range pi.Definitions {
+			statsTbl := h.GetPartitionStats(tableInfo, def.ID)
+			c.Assert(statsTbl.ModifyCount, Equals, int64(1))
+			c.Assert(statsTbl.Count, Equals, int64(1))
+			c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(2))
+		}
 
-	testKit.MustExec(`update t set a = a + 1, b = "aa"`)
-	c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
-	c.Assert(h.Update(is), IsNil)
-	for _, def := range pi.Definitions {
-		statsTbl := h.GetPartitionStats(tableInfo, def.ID)
-		c.Assert(statsTbl.ModifyCount, Equals, int64(2))
-		c.Assert(statsTbl.Count, Equals, int64(1))
-		c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(3))
-	}
+		testKit.MustExec(`update t set a = a + 1, b = "aa"`)
+		c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
+		c.Assert(h.Update(is), IsNil)
+		for _, def := range pi.Definitions {
+			statsTbl := h.GetPartitionStats(tableInfo, def.ID)
+			c.Assert(statsTbl.ModifyCount, Equals, int64(2))
+			c.Assert(statsTbl.Count, Equals, int64(1))
+			c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(3))
+		}
 
-	testKit.MustExec("delete from t")
-	c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
-	c.Assert(h.Update(is), IsNil)
-	for _, def := range pi.Definitions {
-		statsTbl := h.GetPartitionStats(tableInfo, def.ID)
-		c.Assert(statsTbl.ModifyCount, Equals, int64(3))
-		c.Assert(statsTbl.Count, Equals, int64(0))
-		c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(0))
-	}
+		testKit.MustExec("delete from t")
+		c.Assert(h.DumpStatsDeltaToKV(handle.DumpAll), IsNil)
+		c.Assert(h.Update(is), IsNil)
+		for _, def := range pi.Definitions {
+			statsTbl := h.GetPartitionStats(tableInfo, def.ID)
+			c.Assert(statsTbl.ModifyCount, Equals, int64(3))
+			c.Assert(statsTbl.Count, Equals, int64(0))
+			c.Assert(statsTbl.Columns[bColID].TotColSize, Equals, int64(0))
+		}
+	})
 }
 
 func (s *testStatsSuite) TestAutoUpdate(c *C) {
diff --git a/store/tikv/2pc.go b/store/tikv/2pc.go
index 9d2ebc089e7ca..761deb2592b59 100644
--- a/store/tikv/2pc.go
+++ b/store/tikv/2pc.go
@@ -31,6 +31,7 @@ import (
 	"github.com/pingcap/parser/terror"
 	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/meta"
 	"github.com/pingcap/tidb/metrics"
 	"github.com/pingcap/tidb/sessionctx/binloginfo"
 	"github.com/pingcap/tidb/store/tikv/oracle"
@@ -959,29 +960,45 @@ func (c *twoPhaseCommitter) execute(ctx context.Context) (err error) {
 		logutil.SetTag(ctx, "commitTs", commitTS)
 	}
 
-	tryAmend := c.isPessimistic && c.connID > 0 && !c.isAsyncCommit() && c.txn.schemaAmender != nil
-	if !tryAmend {
-		_, _, err = c.checkSchemaValid(ctx, commitTS, c.txn.txnInfoSchema, false)
+	if c.connID > 0 {
+		failpoint.Inject("beforeSchemaCheck", func() {
+			failpoint.Return()
+		})
+	}
+
+	if c.isAsyncCommit() {
+		schemaVerIsTheSame, err := checkSchemaVersionForAsyncCommit(ctx, c.startTS, commitTS, c.store)
 		if err != nil {
 			return errors.Trace(err)
 		}
-	} else {
-		relatedSchemaChange, memAmended, err := c.checkSchemaValid(ctx, commitTS, c.txn.txnInfoSchema, true)
-		if err != nil {
-			return errors.Trace(err)
+		if !schemaVerIsTheSame {
+			return errors.Trace(errors.Errorf("Schema changed for async commit startTS=%v commitTS=%v", c.startTS, commitTS))
 		}
-		if memAmended {
-			// Get new commitTS and check schema valid again.
-			newCommitTS, err := c.getCommitTS(ctx, commitDetail)
+	} else {
+		tryAmend := c.isPessimistic && c.connID > 0 && c.txn.schemaAmender != nil
+		if !tryAmend {
+			_, _, err = c.checkSchemaValid(ctx, commitTS, c.txn.txnInfoSchema, false)
 			if err != nil {
 				return errors.Trace(err)
 			}
-			// If schema check failed between commitTS and newCommitTs, report schema change error.
-			_, _, err = c.checkSchemaValid(ctx, newCommitTS, relatedSchemaChange.LatestInfoSchema, false)
+		} else {
+			relatedSchemaChange, memAmended, err := c.checkSchemaValid(ctx, commitTS, c.txn.txnInfoSchema, true)
 			if err != nil {
 				return errors.Trace(err)
 			}
-			commitTS = newCommitTS
+			if memAmended {
+				// Get new commitTS and check schema valid again.
+				newCommitTS, err := c.getCommitTS(ctx, commitDetail)
+				if err != nil {
+					return errors.Trace(err)
+				}
+				// If schema check failed between commitTS and newCommitTs, report schema change error.
+				_, _, err = c.checkSchemaValid(ctx, newCommitTS, relatedSchemaChange.LatestInfoSchema, false)
+				if err != nil {
+					return errors.Trace(err)
+				}
+				commitTS = newCommitTS
+			}
 		}
 	}
 	c.commitTS = commitTS
@@ -999,8 +1016,9 @@ func (c *twoPhaseCommitter) execute(ctx context.Context) (err error) {
 	if c.isAsyncCommit() {
 		// For async commit protocol, the commit is considered success here.
 		c.txn.commitTS = c.commitTS
-		logutil.Logger(ctx).Info("2PC will use async commit protocol to commit this txn", zap.Uint64("startTS", c.startTS),
-			zap.Uint64("commitTS", c.commitTS))
+		logutil.Logger(ctx).Info("2PC will use async commit protocol to commit this txn",
+			zap.Uint64("startTS", c.startTS), zap.Uint64("commitTS", c.commitTS),
+			zap.Uint64("connID", c.connID))
 		go func() {
 			failpoint.Inject("asyncCommitDoNothing", func() {
 				failpoint.Return()
@@ -1476,3 +1494,41 @@ func (c *twoPhaseCommitter) getUndeterminedErr() error {
 	defer c.mu.RUnlock()
 	return c.mu.undeterminedErr
 }
+
+// checkSchemaVersionForAsyncCommit is used to check schema version change for async commit transactions
+// only. For async commit protocol, we need to make sure the check result is the same during common execution
+// path and the recovery path. As the schema lease checker has a limited size of cached schema diff version, it's
+// possible the schema cache is changed and the schema lease checker can't decide if the related table has
+// schema version change. So we just check the version from meta snapshot, it's much stricter.
+func checkSchemaVersionForAsyncCommit(ctx context.Context, startTS uint64, commitTS uint64, store Storage) (bool, error) {
+	if commitTS > 0 {
+		snapshotAtStart, err := store.GetSnapshot(kv.NewVersion(startTS))
+		if err != nil {
+			logutil.Logger(ctx).Error("get snapshot failed for resolve async startTS",
+				zap.Uint64("startTS", startTS), zap.Uint64("commitTS", commitTS))
+			return false, errors.Trace(err)
+		}
+		snapShotAtCommit, err := store.GetSnapshot(kv.NewVersion(commitTS))
+		if err != nil {
+			logutil.Logger(ctx).Error("get snapshot failed for resolve async commitTS",
+				zap.Uint64("startTS", startTS), zap.Uint64("commitTS", commitTS))
+			return false, errors.Trace(err)
+		}
+		schemaVerAtStart, err := meta.NewSnapshotMeta(snapshotAtStart).GetSchemaVersion()
+		if err != nil {
+			return false, errors.Trace(err)
+		}
+		schemaVerAtCommit, err := meta.NewSnapshotMeta(snapShotAtCommit).GetSchemaVersion()
+		if err != nil {
+			return false, errors.Trace(err)
+		}
+		if schemaVerAtStart != schemaVerAtCommit {
+			logutil.Logger(ctx).Info("async commit txn need to rollback since schema version has changed",
+				zap.Uint64("startTS", startTS), zap.Uint64("commitTS", commitTS),
+				zap.Int64("schema version at start", schemaVerAtStart),
+				zap.Int64("schema version at commit", schemaVerAtCommit))
+			return false, nil
+		}
+	}
+	return true, nil
+}
diff --git a/store/tikv/2pc_test.go b/store/tikv/2pc_test.go
index 8bbb53225a0f2..27cce10ed2ced 100644
--- a/store/tikv/2pc_test.go
+++ b/store/tikv/2pc_test.go
@@ -1228,8 +1228,6 @@ func (s *testCommitterSuite) TestAsyncCommit(c *C) {
 	err = committer.execute(ctx)
 	c.Assert(err, IsNil)
 
-	// TODO remove sleep when recovery logic is done
-	time.Sleep(1 * time.Second)
 	s.checkValues(c, map[string]string{
 		string(pk): string(pkVal),
 		string(k1): string(k1Val),
diff --git a/store/tikv/async_commit_fail_test.go b/store/tikv/async_commit_fail_test.go
index 2ded260a50964..837c81789337e 100644
--- a/store/tikv/async_commit_fail_test.go
+++ b/store/tikv/async_commit_fail_test.go
@@ -26,28 +26,17 @@ import (
 	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/sessionctx"
-	"github.com/pingcap/tidb/store/mockstore/cluster"
-	"github.com/pingcap/tidb/store/mockstore/unistore"
 )
 
 type testAsyncCommitFailSuite struct {
 	OneByOneSuite
 	testAsyncCommitCommon
-	cluster cluster.Cluster
-	store   *tikvStore
 }
 
 var _ = SerialSuites(&testAsyncCommitFailSuite{})
 
 func (s *testAsyncCommitFailSuite) SetUpTest(c *C) {
-	client, pdClient, cluster, err := unistore.New("")
-	c.Assert(err, IsNil)
-	unistore.BootstrapWithSingleStore(cluster)
-	s.cluster = cluster
-	store, err := NewTestTiKVStore(client, pdClient, nil, nil, 0)
-	c.Assert(err, IsNil)
-
-	s.store = store.(*tikvStore)
+	s.testAsyncCommitCommon.setUpTest(c)
 }
 
 // TestFailCommitPrimaryRpcErrors tests rpc errors are handled properly when
@@ -85,13 +74,47 @@ func (s *testAsyncCommitFailSuite) TestFailAsyncCommitPrewriteRpcErrors(c *C) {
 	c.Assert(bytes.Equal(res, []byte("a1")), IsTrue)
 }
 
+func (s *testAsyncCommitFailSuite) TestPointGetWithAsyncCommit(c *C) {
+	defer config.RestoreFunc()()
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.TiKVClient.AsyncCommit.Enable = true
+	})
+
+	s.putAlphabets(c)
+
+	txn, err := s.store.Begin()
+	c.Assert(err, IsNil)
+	txn.Set([]byte("a"), []byte("v1"))
+	txn.Set([]byte("b"), []byte("v2"))
+	s.mustPointGet(c, []byte("a"), []byte("a"))
+	s.mustPointGet(c, []byte("b"), []byte("b"))
+
+	// PointGet cannot ignore async commit transactions' locks.
+	c.Assert(failpoint.Enable("github.com/pingcap/tidb/store/tikv/asyncCommitDoNothing", "return"), IsNil)
+	ctx := context.WithValue(context.Background(), sessionctx.ConnID, uint64(1))
+	err = txn.Commit(ctx)
+	c.Assert(err, IsNil)
+	c.Assert(txn.(*tikvTxn).committer.isAsyncCommit(), IsTrue)
+	s.mustPointGet(c, []byte("a"), []byte("v1"))
+	s.mustPointGet(c, []byte("b"), []byte("v2"))
+	c.Assert(failpoint.Disable("github.com/pingcap/tidb/store/tikv/asyncCommitDoNothing"), IsNil)
+
+	// PointGet will not push the `max_ts` to its ts which is MaxUint64.
+	txn2, err := s.store.Begin()
+	c.Assert(err, IsNil)
+	s.mustGetFromTxn(c, txn2, []byte("a"), []byte("v1"))
+	s.mustGetFromTxn(c, txn2, []byte("b"), []byte("v2"))
+	err = txn2.Rollback()
+	c.Assert(err, IsNil)
+}
+
 func (s *testAsyncCommitFailSuite) TestSecondaryListInPrimaryLock(c *C) {
 	defer config.RestoreFunc()()
 	config.UpdateGlobal(func(conf *config.Config) {
 		conf.TiKVClient.AsyncCommit.Enable = true
 	})
 
-	s.putAlphabets(c, s.store)
+	s.putAlphabets(c)
 
 	// Split into several regions.
 	for _, splitKey := range []string{"h", "o", "u"} {
diff --git a/store/tikv/async_commit_test.go b/store/tikv/async_commit_test.go
index fcd452f9d2dde..b3cfff13c5378 100644
--- a/store/tikv/async_commit_test.go
+++ b/store/tikv/async_commit_test.go
@@ -24,24 +24,21 @@ import (
 	"github.com/pingcap/errors"
 	"github.com/pingcap/kvproto/pkg/kvrpcpb"
 	"github.com/pingcap/tidb/config"
+	"github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/store/mockstore/cluster"
 	"github.com/pingcap/tidb/store/mockstore/unistore"
 	"github.com/pingcap/tidb/store/tikv/tikvrpc"
 )
 
-type testAsyncCommitCommon struct{}
-
-type testAsyncCommitSuite struct {
-	OneByOneSuite
-	testAsyncCommitCommon
+// testAsyncCommitCommon is used to put common parts that will be both used by
+// testAsyncCommitSuite and testAsyncCommitFailSuite.
+type testAsyncCommitCommon struct {
 	cluster cluster.Cluster
 	store   *tikvStore
-	bo      *Backoffer
 }
 
-var _ = Suite(&testAsyncCommitSuite{})
-
-func (s *testAsyncCommitSuite) SetUpTest(c *C) {
+func (s *testAsyncCommitCommon) setUpTest(c *C) {
 	client, pdClient, cluster, err := unistore.New("")
 	c.Assert(err, IsNil)
 	unistore.BootstrapWithSingleStore(cluster)
@@ -50,17 +47,16 @@ func (s *testAsyncCommitSuite) SetUpTest(c *C) {
 	c.Assert(err, IsNil)
 
 	s.store = store.(*tikvStore)
-	s.bo = NewBackofferWithVars(context.Background(), 5000, nil)
 }
 
-func (s *testAsyncCommitCommon) putAlphabets(c *C, store *tikvStore) {
+func (s *testAsyncCommitCommon) putAlphabets(c *C) {
 	for ch := byte('a'); ch <= byte('z'); ch++ {
-		s.putKV(c, store, []byte{ch}, []byte{ch})
+		s.putKV(c, []byte{ch}, []byte{ch})
 	}
 }
 
-func (s *testAsyncCommitCommon) putKV(c *C, store *tikvStore, key, value []byte) (uint64, uint64) {
-	txn, err := store.Begin()
+func (s *testAsyncCommitCommon) putKV(c *C, key, value []byte) (uint64, uint64) {
+	txn, err := s.store.Begin()
 	c.Assert(err, IsNil)
 	err = txn.Set(key, value)
 	c.Assert(err, IsNil)
@@ -69,6 +65,53 @@ func (s *testAsyncCommitCommon) putKV(c *C, store *tikvStore, key, value []byte)
 	return txn.StartTS(), txn.(*tikvTxn).commitTS
 }
 
+func (s *testAsyncCommitCommon) mustGetFromTxn(c *C, txn kv.Transaction, key, expectedValue []byte) {
+	v, err := txn.Get(context.Background(), key)
+	c.Assert(err, IsNil)
+	c.Assert(v, BytesEquals, expectedValue)
+}
+
+func (s *testAsyncCommitCommon) mustGetLock(c *C, key []byte) *Lock {
+	ver, err := s.store.CurrentVersion()
+	c.Assert(err, IsNil)
+	req := tikvrpc.NewRequest(tikvrpc.CmdGet, &kvrpcpb.GetRequest{
+		Key:     key,
+		Version: ver.Ver,
+	})
+	bo := NewBackofferWithVars(context.Background(), 5000, nil)
+	loc, err := s.store.regionCache.LocateKey(bo, key)
+	c.Assert(err, IsNil)
+	resp, err := s.store.SendReq(bo, req, loc.Region, readTimeoutShort)
+	c.Assert(err, IsNil)
+	c.Assert(resp.Resp, NotNil)
+	keyErr := resp.Resp.(*kvrpcpb.GetResponse).GetError()
+	c.Assert(keyErr, NotNil)
+	lock, err := extractLockFromKeyErr(keyErr)
+	c.Assert(err, IsNil)
+	return lock
+}
+
+func (s *testAsyncCommitCommon) mustPointGet(c *C, key, expectedValue []byte) {
+	snap, err := s.store.GetSnapshot(kv.MaxVersion)
+	c.Assert(err, IsNil)
+	value, err := snap.Get(context.Background(), key)
+	c.Assert(err, IsNil)
+	c.Assert(value, BytesEquals, expectedValue)
+}
+
+type testAsyncCommitSuite struct {
+	OneByOneSuite
+	testAsyncCommitCommon
+	bo *Backoffer
+}
+
+var _ = Suite(&testAsyncCommitSuite{})
+
+func (s *testAsyncCommitSuite) SetUpTest(c *C) {
+	s.testAsyncCommitCommon.setUpTest(c)
+	s.bo = NewBackofferWithVars(context.Background(), 5000, nil)
+}
+
 func (s *testAsyncCommitSuite) lockKeys(c *C, keys, values [][]byte, primaryKey, primaryValue []byte, commitPrimary bool) (uint64, uint64) {
 	txn, err := newTiKVTxn(s.store)
 	c.Assert(err, IsNil)
@@ -103,32 +146,13 @@ func (s *testAsyncCommitSuite) lockKeys(c *C, keys, values [][]byte, primaryKey,
 	return txn.startTS, tpc.commitTS
 }
 
-func (s *testAsyncCommitSuite) mustGetLock(c *C, key []byte) *Lock {
-	ver, err := s.store.CurrentVersion()
-	c.Assert(err, IsNil)
-	req := tikvrpc.NewRequest(tikvrpc.CmdGet, &kvrpcpb.GetRequest{
-		Key:     key,
-		Version: ver.Ver,
-	})
-	loc, err := s.store.regionCache.LocateKey(s.bo, key)
-	c.Assert(err, IsNil)
-	resp, err := s.store.SendReq(s.bo, req, loc.Region, readTimeoutShort)
-	c.Assert(err, IsNil)
-	c.Assert(resp.Resp, NotNil)
-	keyErr := resp.Resp.(*kvrpcpb.GetResponse).GetError()
-	c.Assert(keyErr, NotNil)
-	lock, err := extractLockFromKeyErr(keyErr)
-	c.Assert(err, IsNil)
-	return lock
-}
-
 func (s *testAsyncCommitSuite) TestCheckSecondaries(c *C) {
 	defer config.RestoreFunc()()
 	config.UpdateGlobal(func(conf *config.Config) {
 		conf.TiKVClient.AsyncCommit.Enable = true
 	})
 
-	s.putAlphabets(c, s.store)
+	s.putAlphabets(c)
 
 	loc, err := s.store.GetRegionCache().LocateKey(s.bo, []byte("a"))
 	c.Assert(err, IsNil)
@@ -269,6 +293,52 @@ func (s *testAsyncCommitSuite) TestCheckSecondaries(c *C) {
 	c.Assert(gotOther, Equals, int64(0))
 }
 
+func (s *testAsyncCommitSuite) TestRepeatableRead(c *C) {
+	defer config.RestoreFunc()()
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.TiKVClient.AsyncCommit.Enable = true
+	})
+
+	var connID uint64 = 0
+	test := func(isPessimistic bool) {
+		s.putKV(c, []byte("k1"), []byte("v1"))
+
+		connID++
+		ctx := context.WithValue(context.Background(), sessionctx.ConnID, connID)
+		txn1, err := s.store.Begin()
+		txn1.SetOption(kv.Pessimistic, isPessimistic)
+		c.Assert(err, IsNil)
+		s.mustGetFromTxn(c, txn1, []byte("k1"), []byte("v1"))
+		txn1.Set([]byte("k1"), []byte("v2"))
+
+		for i := 0; i < 20; i++ {
+			_, err := s.store.GetOracle().GetTimestamp(ctx)
+			c.Assert(err, IsNil)
+		}
+
+		txn2, err := s.store.Begin()
+		c.Assert(err, IsNil)
+		s.mustGetFromTxn(c, txn2, []byte("k1"), []byte("v1"))
+
+		err = txn1.Commit(ctx)
+		c.Assert(err, IsNil)
+		// Check txn1 is committed in async commit.
+		c.Assert(txn1.(*tikvTxn).committer.isAsyncCommit(), IsTrue)
+		s.mustGetFromTxn(c, txn2, []byte("k1"), []byte("v1"))
+		err = txn2.Rollback()
+		c.Assert(err, IsNil)
+
+		txn3, err := s.store.Begin()
+		c.Assert(err, IsNil)
+		s.mustGetFromTxn(c, txn3, []byte("k1"), []byte("v2"))
+		err = txn3.Rollback()
+		c.Assert(err, IsNil)
+	}
+
+	test(false)
+	test(true)
+}
+
 type mockResolveClient struct {
 	inner              Client
 	onResolveLock      func(*kvrpcpb.ResolveLockRequest) (*tikvrpc.Response, error)
diff --git a/store/tikv/client.go b/store/tikv/client.go
index cc69766f18a83..44756f83840b2 100644
--- a/store/tikv/client.go
+++ b/store/tikv/client.go
@@ -16,6 +16,7 @@ package tikv
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"math"
 	"runtime/trace"
@@ -42,6 +43,7 @@ import (
 	"google.golang.org/grpc/backoff"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/encoding/gzip"
 	"google.golang.org/grpc/keepalive"
 )
 
@@ -134,6 +136,11 @@ func (a *connArray) Init(addr string, security config.Security, idleNotify *uint
 	keepAliveTimeout := cfg.TiKVClient.GrpcKeepAliveTimeout
 	for i := range a.v {
 		ctx, cancel := context.WithTimeout(context.Background(), a.dialTimeout)
+		var callOptions []grpc.CallOption
+		callOptions = append(callOptions, grpc.MaxCallRecvMsgSize(MaxRecvMsgSize))
+		if cfg.TiKVClient.GrpcCompressionType == gzip.Name {
+			callOptions = append(callOptions, grpc.UseCompressor(gzip.Name))
+		}
 		conn, err := grpc.DialContext(
 			ctx,
 			addr,
@@ -142,7 +149,7 @@ func (a *connArray) Init(addr string, security config.Security, idleNotify *uint
 			grpc.WithInitialConnWindowSize(grpcInitialConnWindowSize),
 			grpc.WithUnaryInterceptor(unaryInterceptor),
 			grpc.WithStreamInterceptor(streamInterceptor),
-			grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(MaxRecvMsgSize)),
+			grpc.WithDefaultCallOptions(callOptions...),
 			grpc.WithConnectParams(grpc.ConnectParams{
 				Backoff: backoff.Config{
 					BaseDelay:  100 * time.Millisecond, // Default was 1s.
@@ -319,7 +326,7 @@ func (c *rpcClient) updateTiKVSendReqHistogram(req *tikvrpc.Request, start time.
 // SendRequest sends a Request to server and receives Response.
 func (c *rpcClient) SendRequest(ctx context.Context, addr string, req *tikvrpc.Request, timeout time.Duration) (*tikvrpc.Response, error) {
 	if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
-		span1 := span.Tracer().StartSpan("rpcClient.SendRequest", opentracing.ChildOf(span.Context()))
+		span1 := span.Tracer().StartSpan(fmt.Sprintf("rpcClient.SendRequest, region ID: %d, type: %s", req.RegionId, req.Type), opentracing.ChildOf(span.Context()))
 		defer span1.Finish()
 		ctx = opentracing.ContextWithSpan(ctx, span1)
 	}
diff --git a/store/tikv/lock_resolver.go b/store/tikv/lock_resolver.go
index 54bb85934f0f2..3fa6fc8c8a3bc 100644
--- a/store/tikv/lock_resolver.go
+++ b/store/tikv/lock_resolver.go
@@ -807,7 +807,15 @@ func (lr *LockResolver) checkAllSecondaries(bo *Backoffer, l *Lock, status *TxnS
 		return nil, errors.Errorf("async commit recovery (sending CheckSecondaryLocks) finished with errors: %v", errs)
 	}
 
-	// TODO(nrc, cfzjywxk) schema lease check
+	if shared.commitTs > 0 {
+		schemaVerIsTheSame, err := checkSchemaVersionForAsyncCommit(bo.ctx, l.TxnID, shared.commitTs, lr.store)
+		if err != nil {
+			return nil, errors.Trace(err)
+		}
+		if !schemaVerIsTheSame {
+			shared.commitTs = 0
+		}
+	}
 
 	return &shared, nil
 }
diff --git a/store/tikv/region_request.go b/store/tikv/region_request.go
index 447f6b1fad986..a4f10998b49c5 100644
--- a/store/tikv/region_request.go
+++ b/store/tikv/region_request.go
@@ -217,7 +217,7 @@ func (s *RegionRequestSender) SendReqCtx(
 	err error,
 ) {
 	if span := opentracing.SpanFromContext(bo.ctx); span != nil && span.Tracer() != nil {
-		span1 := span.Tracer().StartSpan("regionReqauest.SendReqCtx", opentracing.ChildOf(span.Context()))
+		span1 := span.Tracer().StartSpan("regionRequest.SendReqCtx", opentracing.ChildOf(span.Context()))
 		defer span1.Finish()
 		bo = bo.Clone()
 		bo.ctx = opentracing.ContextWithSpan(bo.ctx, span1)
diff --git a/store/tikv/txn.go b/store/tikv/txn.go
index 401900a74dc60..be33ed4ab341c 100644
--- a/store/tikv/txn.go
+++ b/store/tikv/txn.go
@@ -45,6 +45,7 @@ var (
 	tikvTxnCmdHistogramWithRollback = metrics.TiKVTxnCmdHistogram.WithLabelValues(metrics.LblRollback)
 	tikvTxnCmdHistogramWithBatchGet = metrics.TiKVTxnCmdHistogram.WithLabelValues(metrics.LblBatchGet)
 	tikvTxnCmdHistogramWithGet      = metrics.TiKVTxnCmdHistogram.WithLabelValues(metrics.LblGet)
+	tikvTxnCmdHistogramWithLockKeys = metrics.TiKVTxnCmdHistogram.WithLabelValues(metrics.LblLockKeys)
 )
 
 // SchemaAmender is used by pessimistic transactions to amend commit mutations for schema change during 2pc.
@@ -368,6 +369,7 @@ func (txn *tikvTxn) LockKeys(ctx context.Context, lockCtx *kv.LockCtx, keysInput
 	txn.mu.Lock()
 	defer txn.mu.Unlock()
 	defer func() {
+		tikvTxnCmdHistogramWithLockKeys.Observe(time.Since(startTime).Seconds())
 		if err == nil {
 			if lockCtx.PessimisticLockWaited != nil {
 				if atomic.LoadInt32(lockCtx.PessimisticLockWaited) > 0 {
diff --git a/table/column.go b/table/column.go
index 4fe3f3bf5be0b..783be21341d7e 100644
--- a/table/column.go
+++ b/table/column.go
@@ -393,13 +393,7 @@ func CheckNotNull(cols []*Column, row []types.Datum) error {
 
 // GetColOriginDefaultValue gets default value of the column from original default value.
 func GetColOriginDefaultValue(ctx sessionctx.Context, col *model.ColumnInfo) (types.Datum, error) {
-	// If the column type is BIT, both `OriginDefaultValue` and `DefaultValue` of ColumnInfo are corrupted, because
-	// after JSON marshaling and unmarshaling against the field with type `interface{}`, the content with actual type `[]byte` is changed.
-	// We need `DefaultValueBit` to restore OriginDefaultValue before reading it.
-	if col.Tp == mysql.TypeBit && col.DefaultValueBit != nil && col.OriginDefaultValue != nil {
-		col.OriginDefaultValue = col.DefaultValueBit
-	}
-	return getColDefaultValue(ctx, col, col.OriginDefaultValue)
+	return getColDefaultValue(ctx, col, col.GetOriginDefaultValue())
 }
 
 // GetColDefaultValue gets default value of the column.
diff --git a/table/tables/tables.go b/table/tables/tables.go
index c75dedc0f2fab..67eb1e9723fdb 100644
--- a/table/tables/tables.go
+++ b/table/tables/tables.go
@@ -442,7 +442,7 @@ func (t *TableCommon) UpdateRecord(ctx context.Context, sctx sessionctx.Context,
 		oldLen := size - 1
 		colSize[col.ID] = int64(newLen - oldLen)
 	}
-	sessVars.TxnCtx.UpdateDeltaForTable(t.physicalTableID, 0, 1, colSize)
+	sessVars.TxnCtx.UpdateDeltaForTable(t.tableID, t.physicalTableID, 0, 1, colSize, sessVars.UseDynamicPartitionPrune())
 	return nil
 }
 
@@ -786,7 +786,7 @@ func (t *TableCommon) AddRecord(sctx sessionctx.Context, r []types.Datum, opts .
 		}
 		colSize[col.ID] = int64(size) - 1
 	}
-	sessVars.TxnCtx.UpdateDeltaForTable(t.physicalTableID, 1, 1, colSize)
+	sessVars.TxnCtx.UpdateDeltaForTable(t.tableID, t.physicalTableID, 1, 1, colSize, sessVars.UseDynamicPartitionPrune())
 	return recordID, nil
 }
 
@@ -1011,7 +1011,7 @@ func (t *TableCommon) RemoveRecord(ctx sessionctx.Context, h kv.Handle, r []type
 		}
 		colSize[col.ID] = -int64(size - 1)
 	}
-	ctx.GetSessionVars().TxnCtx.UpdateDeltaForTable(t.physicalTableID, -1, 1, colSize)
+	ctx.GetSessionVars().TxnCtx.UpdateDeltaForTable(t.tableID, t.physicalTableID, -1, 1, colSize, ctx.GetSessionVars().UseDynamicPartitionPrune())
 	return err
 }
 
@@ -1253,7 +1253,7 @@ func tryDecodeColumnFromCommonHandle(col *table.Column, handle kv.Handle, pkIds
 // The defaultVals is used to avoid calculating the default value multiple times.
 func GetColDefaultValue(ctx sessionctx.Context, col *table.Column, defaultVals []types.Datum) (
 	colVal types.Datum, err error) {
-	if col.OriginDefaultValue == nil && mysql.HasNotNullFlag(col.Flag) {
+	if col.GetOriginDefaultValue() == nil && mysql.HasNotNullFlag(col.Flag) {
 		return colVal, errors.New("Miss column")
 	}
 	if col.State != model.StatePublic {
diff --git a/types/convert.go b/types/convert.go
index 02d2c0f187cf9..f3f8d291aeedf 100644
--- a/types/convert.go
+++ b/types/convert.go
@@ -654,6 +654,9 @@ func getValidFloatPrefix(sc *stmtctx.StatementContext, s string, isFuncCast bool
 				break
 			}
 			eIdx = i
+		} else if c == '\u0000' {
+			s = s[:validLen]
+			break
 		} else if c < '0' || c > '9' {
 			break
 		} else {
diff --git a/types/convert_test.go b/types/convert_test.go
index 7d5147f0f7de0..47d4fa0612e78 100644
--- a/types/convert_test.go
+++ b/types/convert_test.go
@@ -867,6 +867,7 @@ func (s *testTypeConvertSuite) TestGetValidFloat(c *C) {
 		{"123.e", "123."},
 		{"0-123", "0"},
 		{"9-3", "9"},
+		{"1001001\\u0000\\u0000\\u0000", "1001001"},
 	}
 	sc := new(stmtctx.StatementContext)
 	for _, tt := range tests {
diff --git a/types/datum.go b/types/datum.go
index 03982a0b171e3..464d213a040ec 100644
--- a/types/datum.go
+++ b/types/datum.go
@@ -1380,9 +1380,14 @@ func (d *Datum) convertToMysqlBit(sc *stmtctx.StatementContext, target *FieldTyp
 		uintDatum, err1 := d.convertToUint(sc, target)
 		uintValue, err = uintDatum.GetUint64(), err1
 	}
-	if target.Flen < 64 && uintValue >= 1<<(uint64(target.Flen)) {
+	// Avoid byte size panic, never goto this branch.
+	if target.Flen <= 0 || target.Flen >= 128 {
 		return Datum{}, errors.Trace(ErrDataTooLong.GenWithStack("Data Too Long, field len %d", target.Flen))
 	}
+	if target.Flen < 64 && uintValue >= 1<<(uint64(target.Flen)) {
+		uintValue &= (1 << (uint64(target.Flen))) - 1
+		err = ErrDataTooLong.GenWithStack("Data Too Long, field len %d", target.Flen)
+	}
 	byteSize := (target.Flen + 7) >> 3
 	ret.SetMysqlBit(NewBinaryLiteralFromUint(uintValue, byteSize))
 	return ret, errors.Trace(err)
diff --git a/util/admin/admin.go b/util/admin/admin.go
index 902936722d79d..a10045cc13b4d 100644
--- a/util/admin/admin.go
+++ b/util/admin/admin.go
@@ -363,7 +363,7 @@ func CheckRecordAndIndex(sessCtx sessionctx.Context, txn kv.Transaction, t table
 		for i, val := range vals1 {
 			col := cols[i]
 			if val.IsNull() {
-				if mysql.HasNotNullFlag(col.Flag) && col.ToInfo().OriginDefaultValue == nil {
+				if mysql.HasNotNullFlag(col.Flag) && col.ToInfo().GetOriginDefaultValue() == nil {
 					return false, errors.Errorf("Column %v define as not null, but can't find the value where handle is %v", col.Name, h1)
 				}
 				// NULL value is regarded as its default value.
diff --git a/util/chunk/chunk.go b/util/chunk/chunk.go
index ddd01ada18b97..304d9d6c95202 100644
--- a/util/chunk/chunk.go
+++ b/util/chunk/chunk.go
@@ -128,12 +128,12 @@ func renewEmpty(chk *Chunk) *Chunk {
 	return newChk
 }
 
-// MemoryUsage returns the total memory usage of a Chunk in B.
+// MemoryUsage returns the total memory usage of a Chunk in bytes.
 // We ignore the size of Column.length and Column.nullCount
 // since they have little effect of the total memory usage.
 func (c *Chunk) MemoryUsage() (sum int64) {
 	for _, col := range c.columns {
-		curColMemUsage := int64(unsafe.Sizeof(*col)) + int64(cap(col.nullBitmap)) + int64(cap(col.offsets)*4) + int64(cap(col.data)) + int64(cap(col.elemBuf))
+		curColMemUsage := int64(unsafe.Sizeof(*col)) + int64(cap(col.nullBitmap)) + int64(cap(col.offsets)*8) + int64(cap(col.data)) + int64(cap(col.elemBuf))
 		sum += curColMemUsage
 	}
 	return
@@ -695,3 +695,14 @@ func (c *Chunk) Reconstruct() {
 	c.numVirtualRows = len(c.sel)
 	c.sel = nil
 }
+
+// ToString returns all the values in a chunk.
+func (c *Chunk) ToString(ft []*types.FieldType) string {
+	var buf []byte
+	for rowIdx := 0; rowIdx < c.NumRows(); rowIdx++ {
+		row := c.GetRow(rowIdx)
+		buf = append(buf, row.ToString(ft)...)
+		buf = append(buf, '\n')
+	}
+	return string(buf)
+}
diff --git a/util/chunk/chunk_test.go b/util/chunk/chunk_test.go
index 68ef2bad196f9..7bd09ca1e02e7 100644
--- a/util/chunk/chunk_test.go
+++ b/util/chunk/chunk_test.go
@@ -560,11 +560,11 @@ func (s *testChunkSuite) TestChunkMemoryUsage(c *check.C) {
 	initCap := 10
 	chk := NewChunkWithCapacity(fieldTypes, initCap)
 
-	//cap(c.nullBitmap) + cap(c.offsets)*4 + cap(c.data) + cap(c.elemBuf)
+	//cap(c.nullBitmap) + cap(c.offsets)*8 + cap(c.data) + cap(c.elemBuf)
 	colUsage := make([]int, len(fieldTypes))
 	colUsage[0] = (initCap+7)>>3 + 0 + initCap*4 + 4
-	colUsage[1] = (initCap+7)>>3 + (initCap+1)*4 + initCap*8 + 0
-	colUsage[2] = (initCap+7)>>3 + (initCap+1)*4 + initCap*8 + 0
+	colUsage[1] = (initCap+7)>>3 + (initCap+1)*8 + initCap*8 + 0
+	colUsage[2] = (initCap+7)>>3 + (initCap+1)*8 + initCap*8 + 0
 	colUsage[3] = (initCap+7)>>3 + 0 + initCap*sizeTime + sizeTime
 	colUsage[4] = (initCap+7)>>3 + 0 + initCap*8 + 8
 
@@ -596,7 +596,7 @@ func (s *testChunkSuite) TestChunkMemoryUsage(c *check.C) {
 	chk.AppendDuration(4, durationObj)
 
 	memUsage = chk.MemoryUsage()
-	colUsage[1] = (initCap+7)>>3 + (initCap+1)*4 + cap(chk.columns[1].data) + 0
+	colUsage[1] = (initCap+7)>>3 + (initCap+1)*8 + cap(chk.columns[1].data) + 0
 	expectedUsage = 0
 	for i := range colUsage {
 		expectedUsage += colUsage[i] + int(unsafe.Sizeof(*chk.columns[i]))
@@ -786,6 +786,30 @@ func (s *testChunkSuite) TestMakeRefTo(c *check.C) {
 	c.Assert(chk2.columns[1] == chk1.columns[0], check.IsTrue)
 }
 
+func (s *testChunkSuite) TestToString(c *check.C) {
+	fieldTypes := make([]*types.FieldType, 0, 4)
+	fieldTypes = append(fieldTypes, &types.FieldType{Tp: mysql.TypeFloat})
+	fieldTypes = append(fieldTypes, &types.FieldType{Tp: mysql.TypeDouble})
+	fieldTypes = append(fieldTypes, &types.FieldType{Tp: mysql.TypeString})
+	fieldTypes = append(fieldTypes, &types.FieldType{Tp: mysql.TypeDate})
+	fieldTypes = append(fieldTypes, &types.FieldType{Tp: mysql.TypeLonglong})
+
+	chk := NewChunkWithCapacity(fieldTypes, 2)
+	chk.AppendFloat32(0, float32(1))
+	chk.AppendFloat64(1, 1.0)
+	chk.AppendString(2, "1")
+	chk.AppendTime(3, types.ZeroDate)
+	chk.AppendInt64(4, 1)
+
+	chk.AppendFloat32(0, float32(2))
+	chk.AppendFloat64(1, 2.0)
+	chk.AppendString(2, "2")
+	chk.AppendTime(3, types.ZeroDatetime)
+	chk.AppendInt64(4, 2)
+
+	c.Assert(chk.ToString(fieldTypes), check.Equals, "1, 1, 1, 0000-00-00, 1\n2, 2, 2, 0000-00-00 00:00:00, 2\n")
+}
+
 func BenchmarkAppendInt(b *testing.B) {
 	b.ReportAllocs()
 	chk := newChunk(8)
diff --git a/util/chunk/row.go b/util/chunk/row.go
index 5b9bf41684f54..993ec9b58b9d1 100644
--- a/util/chunk/row.go
+++ b/util/chunk/row.go
@@ -14,6 +14,8 @@
 package chunk
 
 import (
+	"strconv"
+
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/types/json"
@@ -213,3 +215,46 @@ func (r Row) CopyConstruct() Row {
 	newChk.AppendRow(r)
 	return newChk.GetRow(0)
 }
+
+// ToString returns all the values in a row.
+func (r Row) ToString(ft []*types.FieldType) string {
+	var buf []byte
+	for colIdx := 0; colIdx < r.Chunk().NumCols(); colIdx++ {
+		if r.IsNull(colIdx) {
+			buf = append(buf, "nil, "...)
+			continue
+		}
+		switch ft[colIdx].EvalType() {
+		case types.ETInt:
+			buf = strconv.AppendInt(buf, r.GetInt64(colIdx), 10)
+		case types.ETString:
+			switch ft[colIdx].Tp {
+			case mysql.TypeEnum:
+				buf = append(buf, r.GetEnum(colIdx).String()...)
+			case mysql.TypeSet:
+				buf = append(buf, r.GetSet(colIdx).String()...)
+			default:
+				buf = append(buf, r.GetString(colIdx)...)
+			}
+		case types.ETDatetime, types.ETTimestamp:
+			buf = append(buf, r.GetTime(colIdx).String()...)
+		case types.ETDecimal:
+			buf = append(buf, r.GetMyDecimal(colIdx).ToString()...)
+		case types.ETDuration:
+			buf = append(buf, r.GetDuration(colIdx, ft[colIdx].Decimal).String()...)
+		case types.ETJson:
+			buf = append(buf, r.GetJSON(colIdx).String()...)
+		case types.ETReal:
+			switch ft[colIdx].Tp {
+			case mysql.TypeFloat:
+				buf = strconv.AppendFloat(buf, float64(r.GetFloat32(colIdx)), 'f', -1, 32)
+			case mysql.TypeDouble:
+				buf = strconv.AppendFloat(buf, r.GetFloat64(colIdx), 'f', -1, 64)
+			}
+		}
+		if colIdx != r.Chunk().NumCols()-1 {
+			buf = append(buf, ", "...)
+		}
+	}
+	return string(buf)
+}
diff --git a/util/execdetails/execdetails.go b/util/execdetails/execdetails.go
index 5b7c28e2d8909..7ebe67f3890ea 100644
--- a/util/execdetails/execdetails.go
+++ b/util/execdetails/execdetails.go
@@ -432,6 +432,8 @@ const (
 	TpSelectResultRuntimeStats
 	// TpInsertRuntimeStat is the tp for InsertRuntimeStat
 	TpInsertRuntimeStat
+	// TpSlowQueryRuntimeStat is the tp for TpSlowQueryRuntimeStat
+	TpSlowQueryRuntimeStat
 )
 
 // RuntimeStats is used to express the executor runtime information.
diff --git a/util/memory/tracker.go b/util/memory/tracker.go
index a0edbdf912c80..d5ad74031ae5a 100644
--- a/util/memory/tracker.go
+++ b/util/memory/tracker.go
@@ -302,6 +302,11 @@ func (t *Tracker) toString(indent string, buffer *bytes.Buffer) {
 
 // BytesToString converts the memory consumption to a readable string.
 func (t *Tracker) BytesToString(numBytes int64) string {
+	return BytesToString(numBytes)
+}
+
+// BytesToString converts the memory consumption to a readable string.
+func BytesToString(numBytes int64) string {
 	GB := float64(numBytes) / float64(1<<30)
 	if GB > 1 {
 		return fmt.Sprintf("%v GB", GB)