*: add TxnManager to manage txn in session

ddl/db_change_test.go

@@ -411,7 +411,9 @@ func (t *testExecInfo) compileSQL(idx int) (err error) {
 		compiler := executor.Compiler{Ctx: c.session}
 		se := c.session
 		ctx := context.TODO()
-		se.PrepareTxnCtx(ctx)
+		if err = se.PrepareTxnCtx(ctx); err != nil {
+			return err
+		}
 		sctx := se.(sessionctx.Context)
 		if err = executor.ResetContextOfStmt(sctx, c.rawStmt); err != nil {
 			return errors.Trace(err)

executor/adapter.go

@@ -46,6 +46,7 @@ import (
 	"github.com/pingcap/tidb/plugin"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/sessionctx/variable"
+	"github.com/pingcap/tidb/sessiontxn"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/execdetails"
@@ -262,6 +263,12 @@ func (a *ExecStmt) PointGet(ctx context.Context, is infoschema.InfoSchema) (*rec
 		a.PsStmt.Executor = newExecutor
 	}
 	pointExecutor := a.PsStmt.Executor.(*PointGetExecutor)
+
+	failpoint.Inject("assertTxnManagerInShortPointGetPlan", func() {
+		sessiontxn.RecordAssert(a.Ctx, "assertTxnManagerInShortPointGetPlan", true)
+		sessiontxn.AssertTxnManagerInfoSchema(a.Ctx, is)
+	})
+
 	if err = pointExecutor.Open(ctx); err != nil {
 		terror.Call(pointExecutor.Close)
 		return nil, err
@@ -297,6 +304,16 @@ func (a *ExecStmt) RebuildPlan(ctx context.Context) (int64, error) {
 	if err := plannercore.Preprocess(a.Ctx, a.StmtNode, plannercore.InTxnRetry, plannercore.WithPreprocessorReturn(ret)); err != nil {
 		return 0, err
 	}
+
+	failpoint.Inject("assertTxnManagerInRebuildPlan", func() {
+		if is, ok := a.Ctx.Value(sessiontxn.AssertTxnInfoSchemaAfterRetryKey).(infoschema.InfoSchema); ok {
+			a.Ctx.SetValue(sessiontxn.AssertTxnInfoSchemaKey, is)
+			a.Ctx.SetValue(sessiontxn.AssertTxnInfoSchemaAfterRetryKey, nil)
+		}
+		sessiontxn.RecordAssert(a.Ctx, "assertTxnManagerInRebuildPlan", true)
+		sessiontxn.AssertTxnManagerInfoSchema(a.Ctx, ret.InfoSchema)
+	})
+
 	a.InfoSchema = ret.InfoSchema
 	a.SnapshotTS = ret.LastSnapshotTS
 	a.IsStaleness = ret.IsStaleness
@@ -753,6 +770,10 @@ func (a *ExecStmt) handlePessimisticLockError(ctx context.Context, err error) (E
 	a.Ctx.GetSessionVars().StmtCtx.ResetForRetry()
 	a.Ctx.GetSessionVars().RetryInfo.ResetOffset()
 
+	failpoint.Inject("assertTxnManagerAfterPessimisticLockErrorRetry", func() {
+		sessiontxn.RecordAssert(a.Ctx, "assertTxnManagerAfterPessimisticLockErrorRetry", true)
+	})
+
 	if err = e.Open(ctx); err != nil {
 		return nil, err
 	}
@@ -807,6 +828,11 @@ func (a *ExecStmt) buildExecutor() (Executor, error) {
 		return nil, errors.Trace(b.err)
 	}
 
+	failpoint.Inject("assertTxnManagerAfterBuildExecutor", func() {
+		sessiontxn.RecordAssert(a.Ctx, "assertTxnManagerAfterBuildExecutor", true)
+		sessiontxn.AssertTxnManagerInfoSchema(b.ctx, b.is)
+	})
+
 	// ExecuteExec is not a real Executor, we only use it to build another Executor from a prepared statement.
 	if executorExec, ok := e.(*ExecuteExec); ok {
 		err := executorExec.Build(b)

executor/compiler.go

@@ -27,6 +27,7 @@ import (
 	"github.com/pingcap/tidb/planner"
 	plannercore "github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/sessionctx"
+	"github.com/pingcap/tidb/sessiontxn"
 )
 
 var (
@@ -57,11 +58,21 @@ func (c *Compiler) Compile(ctx context.Context, stmtNode ast.StmtNode) (*ExecStm
 
 	ret := &plannercore.PreprocessorReturn{}
 	pe := &plannercore.PreprocessExecuteISUpdate{ExecuteInfoSchemaUpdate: planner.GetExecuteForUpdateReadIS, Node: stmtNode}
-	err := plannercore.Preprocess(c.Ctx, stmtNode, plannercore.WithPreprocessorReturn(ret), plannercore.WithExecuteInfoSchemaUpdate(pe))
+	err := plannercore.Preprocess(c.Ctx,
+		stmtNode,
+		plannercore.WithPreprocessorReturn(ret),
+		plannercore.WithExecuteInfoSchemaUpdate(pe),
+		plannercore.InitTxnContextProvider,
+	)
 	if err != nil {
 		return nil, err
 	}
 
+	failpoint.Inject("assertTxnManagerInCompile", func() {
+		sessiontxn.RecordAssert(c.Ctx, "assertTxnManagerInCompile", true)
+		sessiontxn.AssertTxnManagerInfoSchema(c.Ctx, ret.InfoSchema)
+	})
+
 	finalPlan, names, err := planner.Optimize(ctx, c.Ctx, stmtNode, ret.InfoSchema)
 	if err != nil {
 		return nil, err

executor/executor.go

@@ -45,7 +45,6 @@ import (
 	"github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tidb/parser/mysql"
 	"github.com/pingcap/tidb/parser/terror"
-	"github.com/pingcap/tidb/planner"
 	plannercore "github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/privilege"
 	"github.com/pingcap/tidb/sessionctx"
@@ -1718,7 +1717,7 @@ func ResetContextOfStmt(ctx sessionctx.Context, s ast.StmtNode) (err error) {
 		sc.MemTracker.SetActionOnExceed(action)
 	}
 	if execStmt, ok := s.(*ast.ExecuteStmt); ok {
-		prepareStmt, err := planner.GetPreparedStmt(execStmt, vars)
+		prepareStmt, err := plannercore.GetPreparedStmt(execStmt, vars)
 		if err != nil {
 			return err
 		}

executor/prepared.go

@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/failpoint"
 	"github.com/pingcap/log"
 	"github.com/pingcap/tidb/expression"
 	"github.com/pingcap/tidb/infoschema"
@@ -31,6 +32,7 @@ import (
 	plannercore "github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/sessionctx/variable"
+	"github.com/pingcap/tidb/sessiontxn"
 	"github.com/pingcap/tidb/types"
 	driver "github.com/pingcap/tidb/types/parser_driver"
 	"github.com/pingcap/tidb/util"
@@ -340,6 +342,11 @@ func CompileExecutePreparedStmt(ctx context.Context, sctx sessionctx.Context,
 		return nil, false, false, err
 	}
 
+	failpoint.Inject("assertTxnManagerInCompile", func() {
+		sessiontxn.RecordAssert(sctx, "assertTxnManagerInCompile", true)
+		sessiontxn.AssertTxnManagerInfoSchema(sctx, is)
+	})
+
 	stmt := &ExecStmt{
 		GoCtx:       ctx,
 		InfoSchema:  is,

executor/seqtest/prepared_test.go

@@ -163,7 +163,8 @@ func TestPrepared(t *testing.T) {
 		require.Equal(t, query, stmt.OriginText())
 
 		// Check that rebuild plan works.
-		tk.Session().PrepareTxnCtx(ctx)
+		err = tk.Session().PrepareTxnCtx(ctx)
+		require.NoError(t, err)
 		_, err = stmt.RebuildPlan(ctx)
 		require.NoError(t, err)
 		rs, err = stmt.Exec(ctx)

planner/core/cache.go

@@ -19,6 +19,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/parser"
 	"github.com/pingcap/tidb/parser/ast"
@@ -213,3 +214,22 @@ type CachedPrepareStmt struct {
 	ForUpdateRead       bool
 	SnapshotTSEvaluator func(sessionctx.Context) (uint64, error)
 }
+
+// GetPreparedStmt extract the prepared statement from the execute statement.
+func GetPreparedStmt(stmt *ast.ExecuteStmt, vars *variable.SessionVars) (*CachedPrepareStmt, error) {
+	var ok bool
+	execID := stmt.ExecID
+	if stmt.Name != "" {
+		if execID, ok = vars.PreparedStmtNameToID[stmt.Name]; !ok {
+			return nil, ErrStmtNotFound
+		}
+	}
+	if preparedPointer, ok := vars.PreparedStmts[execID]; ok {
+		preparedObj, ok := preparedPointer.(*CachedPrepareStmt)
+		if !ok {
+			return nil, errors.Errorf("invalid CachedPrepareStmt type")
+		}
+		return preparedObj, nil
+	}
+	return nil, ErrStmtNotFound
+}

planner/core/preprocess.go

@@ -37,6 +37,7 @@ import (
 	"github.com/pingcap/tidb/privilege"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/sessionctx/variable"
+	"github.com/pingcap/tidb/sessiontxn"
 	"github.com/pingcap/tidb/table"
 	"github.com/pingcap/tidb/table/temptable"
 	"github.com/pingcap/tidb/types"
@@ -59,6 +60,11 @@ func InTxnRetry(p *preprocessor) {
 	p.flag |= inTxnRetry
 }
 
+// InitTxnContextProvider is a PreprocessOpt that indicates preprocess should init transaction's context
+func InitTxnContextProvider(p *preprocessor) {
+	p.flag |= initTxnContextProvider
+}
+
 // WithPreprocessorReturn returns a PreprocessOpt to initialize the PreprocessorReturn.
 func WithPreprocessorReturn(ret *PreprocessorReturn) PreprocessOpt {
 	return func(p *preprocessor) {
@@ -117,6 +123,9 @@ func Preprocess(ctx sessionctx.Context, node ast.Node, preprocessOpt ...Preproce
 	node.Accept(&v)
 	// InfoSchema must be non-nil after preprocessing
 	v.ensureInfoSchema()
+
+	v.initTxnContextProviderIfNecessary(node)
+
 	return errors.Trace(v.err)
 }
 
@@ -136,6 +145,8 @@ const (
 	// inSequenceFunction is set when visiting a sequence function.
 	// This flag indicates the tableName in these function should be checked as sequence object.
 	inSequenceFunction
+	// initTxnContextProvider is set when we should init txn context in preprocess
+	initTxnContextProvider
 )
 
 // Make linter happy.
@@ -193,6 +204,9 @@ func (p *preprocessor) Enter(in ast.Node) (out ast.Node, skipChildren bool) {
 		// handle the insert table name imminently
 		// insert into t with t ..., the insert can not see t here. We should hand it before the CTE statement
 		p.handleTableName(node.Table.TableRefs.Left.(*ast.TableSource).Source.(*ast.TableName))
+	case *ast.ExecuteStmt:
+		p.stmtTp = TypeExecute
+		p.resolveExecuteStmt(node)
 	case *ast.CreateTableStmt:
 		p.stmtTp = TypeCreate
 		p.flag |= inCreateOrDropTable
@@ -361,6 +375,8 @@ const (
 	TypeRepair
 	// TypeShow for ShowStmt
 	TypeShow
+	// TypeExecute for ExecuteStmt
+	TypeExecute
 )
 
 func bindableStmtType(node ast.StmtNode) byte {
@@ -1489,6 +1505,32 @@ func (p *preprocessor) resolveShowStmt(node *ast.ShowStmt) {
 	}
 }
 
+func (p *preprocessor) resolveExecuteStmt(node *ast.ExecuteStmt) {
+	prepared, err := GetPreparedStmt(node, p.ctx.GetSessionVars())
+	if err != nil {
+		p.err = err
+		return
+	}
+
+	if prepared.SnapshotTSEvaluator != nil {
+		snapshotTS, err := prepared.SnapshotTSEvaluator(p.ctx)
+		if err != nil {
+			p.err = err
+			return
+		}
+
+		is, err := domain.GetDomain(p.ctx).GetSnapshotInfoSchema(snapshotTS)
+		if err != nil {
+			p.err = err
+			return
+		}
+
+		p.LastSnapshotTS = snapshotTS
+		p.initedLastSnapshotTS = true
+		p.InfoSchema = temptable.AttachLocalTemporaryTableInfoSchema(p.ctx, is)
+	}
+}
+
 func (p *preprocessor) resolveCreateTableStmt(node *ast.CreateTableStmt) {
 	for _, val := range node.Constraints {
 		if val.Refer != nil && val.Refer.Table.Schema.String() == "" {
@@ -1689,3 +1731,13 @@ func (p *preprocessor) ensureInfoSchema() infoschema.InfoSchema {
 	p.InfoSchema = p.ctx.GetInfoSchema().(infoschema.InfoSchema)
 	return p.InfoSchema
 }
+
+func (p *preprocessor) initTxnContextProviderIfNecessary(node ast.Node) {
+	if p.err != nil || p.flag&initTxnContextProvider == 0 {
+		return
+	}
+
+	p.err = sessiontxn.GetTxnManager(p.ctx).SetContextProvider(&sessiontxn.SimpleTxnContextProvider{
+		InfoSchema: p.ensureInfoSchema(),
+	})
+}

planner/optimize.go

@@ -48,29 +48,10 @@ import (
 	"go.uber.org/zap"
 )
 
-// GetPreparedStmt extract the prepared statement from the execute statement.
-func GetPreparedStmt(stmt *ast.ExecuteStmt, vars *variable.SessionVars) (*plannercore.CachedPrepareStmt, error) {
-	var ok bool
-	execID := stmt.ExecID
-	if stmt.Name != "" {
-		if execID, ok = vars.PreparedStmtNameToID[stmt.Name]; !ok {
-			return nil, plannercore.ErrStmtNotFound
-		}
-	}
-	if preparedPointer, ok := vars.PreparedStmts[execID]; ok {
-		preparedObj, ok := preparedPointer.(*plannercore.CachedPrepareStmt)
-		if !ok {
-			return nil, errors.Errorf("invalid CachedPrepareStmt type")
-		}
-		return preparedObj, nil
-	}
-	return nil, plannercore.ErrStmtNotFound
-}
-
 // IsReadOnly check whether the ast.Node is a read only statement.
 func IsReadOnly(node ast.Node, vars *variable.SessionVars) bool {
 	if execStmt, isExecStmt := node.(*ast.ExecuteStmt); isExecStmt {
-		prepareStmt, err := GetPreparedStmt(execStmt, vars)
+		prepareStmt, err := plannercore.GetPreparedStmt(execStmt, vars)
 		if err != nil {
 			logutil.BgLogger().Warn("GetPreparedStmt failed", zap.Error(err))
 			return false