ignore all error for views in engine reload (#13590)

Signed-off-by: Harshit Gangal <harshit@planetscale.com>

go/vt/vttablet/tabletserver/schema/engine.go

@@ -20,7 +20,6 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"net/http"
 	"strings"
@@ -31,7 +30,6 @@ import (
 
 	"vitess.io/vitess/go/sqltypes"
 	"vitess.io/vitess/go/vt/concurrency"
-	"vitess.io/vitess/go/vt/mysqlctl"
 	"vitess.io/vitess/go/vt/mysqlctl/tmutils"
 	"vitess.io/vitess/go/vt/sidecardb"
 
@@ -503,17 +501,8 @@ func (se *Engine) reload(ctx context.Context, includeStats bool) error {
 		tableType := row[1].String()
 		table, err := LoadTable(conn, se.cp.DBName(), tableName, tableType, row[3].ToString())
 		if err != nil {
-			isView := strings.Contains(tableType, tmutils.TableView)
-			var emptyColumnsError mysqlctl.EmptyColumnsErr
-			if errors.As(err, &emptyColumnsError) && isView {
-				log.Warningf("Failed reading schema for the table: %s, error: %v", tableName, err)
-				continue
-			}
-			sqlErr, isSQLErr := mysql.NewSQLErrorFromError(err).(*mysql.SQLError)
-			if isSQLErr && sqlErr != nil && sqlErr.Number() == mysql.ERNoSuchUser && isView {
-				// A VIEW that has an invalid DEFINER, leading to:
-				// ERROR 1449 (HY000): The user specified as a definer (...) does not exist
-				log.Warningf("Failed reading schema for the table: %s, error: %v", tableName, err)
+			if isView := strings.Contains(tableType, tmutils.TableView); isView {
+				log.Warningf("Failed reading schema for the view: %s, error: %v", tableName, err)
 				continue
 			}
 			// Non recoverable error:

go/vt/vttablet/tabletserver/schema/engine_test.go

@@ -457,10 +457,46 @@ func TestOpenFailedDueToLoadTableErr(t *testing.T) {
 
 	logs := tl.GetAllLogs()
 	logOutput := strings.Join(logs, ":::")
-	assert.Contains(t, logOutput, "WARNING:Failed reading schema for the table: test_view")
+	assert.Contains(t, logOutput, "WARNING:Failed reading schema for the view: test_view")
 	assert.Contains(t, logOutput, "The user specified as a definer ('root'@'%') does not exist (errno 1449) (sqlstate HY000)")
 }
 
+// TestOpenNoErrorDueToInvalidViews tests that schema engine load does not fail instead should log the failures for the views
+func TestOpenNoErrorDueToInvalidViews(t *testing.T) {
+	tl := syslogger.NewTestLogger()
+	defer tl.Close()
+	db := fakesqldb.New(t)
+	defer db.Close()
+	schematest.AddDefaultQueries(db)
+	db.AddQueryPattern(baseShowTablesPattern, &sqltypes.Result{
+		Fields: mysql.BaseShowTablesFields,
+		Rows: [][]sqltypes.Value{
+			mysql.BaseShowTablesRow("foo_view", true, "VIEW"),
+			mysql.BaseShowTablesRow("bar_view", true, "VIEW"),
+		},
+	})
+
+	// adding column query for table_view
+	db.AddQueryPattern(fmt.Sprintf(mysql.GetColumnNamesQueryPatternForTable, "foo_view"),
+		&sqltypes.Result{})
+	db.AddQueryPattern(fmt.Sprintf(mysql.GetColumnNamesQueryPatternForTable, "bar_view"),
+		sqltypes.MakeTestResult(sqltypes.MakeTestFields("column_name", "varchar"), "col1", "col2"))
+	// rejecting the impossible query
+	db.AddRejectedQuery("SELECT `col1`, `col2` FROM `fakesqldb`.`bar_view` WHERE 1 != 1", mysql.NewSQLError(mysql.ERWrongFieldWithGroup, mysql.SSClientError, "random error for table bar_view"))
+
+	AddFakeInnoDBReadRowsResult(db, 0)
+	se := newEngine(10, 1*time.Second, 1*time.Second, 0, db)
+	err := se.Open()
+	require.NoError(t, err)
+
+	logs := tl.GetAllLogs()
+	logOutput := strings.Join(logs, ":::")
+	assert.Contains(t, logOutput, "WARNING:Failed reading schema for the view: foo_view")
+	assert.Contains(t, logOutput, "unable to get columns for table fakesqldb.foo_view")
+	assert.Contains(t, logOutput, "WARNING:Failed reading schema for the view: bar_view")
+	assert.Contains(t, logOutput, "random error for table bar_view")
+}
+
 func TestExportVars(t *testing.T) {
 	db := fakesqldb.New(t)
 	defer db.Close()