ddl: ddl-owner try to use memory infoSchema to check first

ddl/ddl.go

@@ -279,9 +279,8 @@ type DDL interface {
 
 // ddl is used to handle the statements that define the structure or schema of the database.
 type ddl struct {
-	m          sync.RWMutex
-	infoHandle *infoschema.Handle
-	quitCh     chan struct{}
+	m      sync.RWMutex
+	quitCh chan struct{}
 
 	*ddlCtx
 	workers     map[workerType]*worker
@@ -299,6 +298,7 @@ type ddlCtx struct {
 	ddlEventCh   chan<- *util.Event
 	lease        time.Duration        // lease is schema lease.
 	binlogCli    *pumpcli.PumpsClient // binlogCli is used for Binlog.
+	infoHandle   *infoschema.Handle
 
 	// hook may be modified.
 	mu struct {
@@ -379,12 +379,12 @@ func newDDL(ctx context.Context, etcdCli *clientv3.Client, store kv.Storage,
 		ownerManager: manager,
 		schemaSyncer: syncer,
 		binlogCli:    binloginfo.GetPumpsClient(),
+		infoHandle:   infoHandle,
 	}
 	ddlCtx.mu.hook = hook
 	ddlCtx.mu.interceptor = &BaseInterceptor{}
 	d := &ddl{
-		infoHandle: infoHandle,
-		ddlCtx:     ddlCtx,
+		ddlCtx: ddlCtx,
 	}
 
 	d.start(ctx, ctxPool)

ddl/ddl_worker.go

@@ -523,7 +523,7 @@ func (w *worker) runDDLJob(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64,
 	case model.ActionRebaseAutoID:
 		ver, err = onRebaseAutoID(d.store, t, job)
 	case model.ActionRenameTable:
-		ver, err = onRenameTable(t, job)
+		ver, err = onRenameTable(d, t, job)
 	case model.ActionShardRowID:
 		ver, err = w.onShardRowID(d, t, job)
 	case model.ActionModifyTableComment:

ddl/table.go

@@ -50,7 +50,7 @@ func onCreateTable(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64, _ error)
 	}
 
 	tbInfo.State = model.StateNone
-	err := checkTableNotExists(t, job, schemaID, tbInfo.Name.L)
+	err := checkTableNotExists(d, t, job, schemaID, tbInfo.Name.L)
 	if err != nil {
 		job.State = model.JobStateCancelled
 		return ver, errors.Trace(err)
@@ -94,7 +94,7 @@ func onCreateView(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64, _ error)
 		return ver, errors.Trace(err)
 	}
 	tbInfo.State = model.StateNone
-	err := checkTableNotExists(t, job, schemaID, tbInfo.Name.L)
+	err := checkTableNotExists(d, t, job, schemaID, tbInfo.Name.L)
 	if err != nil {
 		if infoschema.ErrDatabaseNotExists.Equal(err) || !orReplace {
 			job.State = model.JobStateCancelled
@@ -191,7 +191,7 @@ func (w *worker) onRecoverTable(d *ddlCtx, t *meta.Meta, job *model.Job) (ver in
 		return ver, errors.Trace(err)
 	}
 
-	err = checkTableNotExists(t, job, schemaID, tblInfo.Name.L)
+	err = checkTableNotExists(d, t, job, schemaID, tblInfo.Name.L)
 	if err != nil {
 		return ver, errors.Trace(err)
 	}
@@ -525,7 +525,7 @@ func verifyNoOverflowShardBits(s *sessionPool, tbl table.Table, shardRowIDBits u
 	return nil
 }
 
-func onRenameTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
+func onRenameTable(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64, _ error) {
 	var oldSchemaID int64
 	var tableName model.CIStr
 	if err := job.DecodeArgs(&oldSchemaID, &tableName); err != nil {
@@ -539,7 +539,7 @@ func onRenameTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
 		return ver, errors.Trace(err)
 	}
 	newSchemaID := job.SchemaID
-	err = checkTableNotExists(t, job, newSchemaID, tableName.L)
+	err = checkTableNotExists(d, t, job, newSchemaID, tableName.L)
 	if err != nil {
 		job.State = model.JobStateCancelled
 		return ver, errors.Trace(err)
@@ -658,7 +658,32 @@ func onModifyTableCharsetAndCollate(t *meta.Meta, job *model.Job) (ver int64, _
 	return ver, nil
 }
 
-func checkTableNotExists(t *meta.Meta, job *model.Job, schemaID int64, tableName string) error {
+func checkTableNotExists(d *ddlCtx, t *meta.Meta, job *model.Job, schemaID int64, tableName string) error {
+	// d.infoHandle maybe nil in some test.
+	if d.infoHandle != nil {
+		// Try to use memory schema info to check first.
+		currVer, err := t.GetSchemaVersion()
+		if err != nil {
+			return err
+		}
+		is := d.infoHandle.Get()
+		if is.SchemaMetaVersion() == currVer {
+			// Check this table's database.
+			schema, ok := is.SchemaByID(schemaID)
+			if !ok {
+				return infoschema.ErrDatabaseNotExists.GenWithStackByArgs("")
+			}
+			if is.TableExists(schema.Name, model.NewCIStr(tableName)) {
+				return infoschema.ErrTableExists.GenWithStackByArgs(tableName)
+			}
+			return nil
+		}
+	}
+
+	return checkTableNotExistsFromStore(t, job, schemaID, tableName)
+}
+
+func checkTableNotExistsFromStore(t *meta.Meta, job *model.Job, schemaID int64, tableName string) error {
 	// Check this table's database.
 	tables, err := t.ListTables(schemaID)
 	if err != nil {