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ddl: fix drop index failed when index contain auto_increment column and the auto_increment column is primary key (#15861) #16008

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merged 3 commits into from
Apr 14, 2020
Merged

ddl: fix drop index failed when index contain auto_increment column and the auto_increment column is primary key (#15861) #16008

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593eed1
ddl: fix drop index failed when index contain auto_increment column a…
crazycs520 Apr 1, 2020
3713c3d
Merge branch 'release-3.0' into release-3.0-664d5bbef176
crazycs520 Apr 13, 2020
722fc56
Merge branch 'release-3.0' into release-3.0-664d5bbef176
crazycs520 Apr 14, 2020
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6 changes: 5 additions & 1 deletion ddl/index.go
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Original file line number Diff line number Diff line change
Expand Up @@ -592,7 +592,8 @@ func checkDropIndex(t *meta.Meta, job *model.Job) (*model.TableInfo, *model.Inde
func checkDropIndexOnAutoIncrementColumn(tblInfo *model.TableInfo, indexInfo *model.IndexInfo) error {
cols := tblInfo.Columns
for _, idxCol := range indexInfo.Columns {
if !mysql.HasAutoIncrementFlag(cols[idxCol.Offset].Flag) {
flag := cols[idxCol.Offset].Flag
if !mysql.HasAutoIncrementFlag(flag) {
continue
}
// check the count of index on auto_increment column.
Expand All @@ -605,6 +606,9 @@ func checkDropIndexOnAutoIncrementColumn(tblInfo *model.TableInfo, indexInfo *mo
}
}
}
if tblInfo.PKIsHandle && mysql.HasPriKeyFlag(flag) {
count++
}
if count < 2 {
return autoid.ErrWrongAutoKey
}
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8 changes: 8 additions & 0 deletions ddl/serial_test.go
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Expand Up @@ -150,6 +150,14 @@ func (s *testSerialSuite) TestPrimaryKey(c *C) {
c.Assert(err.Error(), Equals, "[ddl:206]Unsupported drop primary key when alter-primary-key is false")
}

func (s *testSerialSuite) TestDropAutoIncrementIndex(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
tk.MustExec("drop table if exists t1")
tk.MustExec("create table t1 (a int(11) not null auto_increment key, b int(11), c bigint, unique key (a, b, c))")
tk.MustExec("alter table t1 drop index a")
}

func (s *testSerialSuite) TestMultiRegionGetTableEndHandle(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("drop database if exists test_get_endhandle")
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