domain: support dump sql meta in plan replayer

domain/plan_replayer.go

@@ -527,6 +527,7 @@ type PlanReplayerDumpTask struct {
 	TblStats   map[int64]interface{}
 
 	// variables used to dump the plan
+	StartTS         uint64
 	SessionBindings []*bindinfo.BindRecord
 	EncodedPlan     string
 	SessionVars     *variable.SessionVars

domain/plan_replayer_dump.go

@@ -41,6 +41,8 @@ import (
 )
 
 const (
+	// planReplayerSQLMeta indicates sql meta path for plan replayer
+	planReplayerSQLMeta = "sql_meta.toml"
 	// PlanReplayerConfigFile indicates config file path for plan replayer
 	PlanReplayerConfigFile = "config.toml"
 	// PlanReplayerMetaFile meta file path for plan replayer
@@ -55,6 +57,11 @@ const (
 	PlanReplayerGlobalBindingFile = "global_bindings.sql"
 )
 
+const (
+	// PlanReplayerSQLMetaStartTS indicates the startTS in plan replayer sql meta
+	PlanReplayerSQLMetaStartTS = "startTS"
+)
+
 type tableNamePair struct {
 	DBName    string
 	TableName string
@@ -131,6 +138,7 @@ func (tne *tableNameExtractor) handleIsView(t *ast.TableName) (bool, error) {
 // DumpPlanReplayerInfo will dump the information about sqls.
 // The files will be organized into the following format:
 /*
+ |-sql_meta.txt
  |-meta.txt
  |-schema
  |	 |-db1.table1.schema.txt
@@ -164,7 +172,7 @@ func DumpPlanReplayerInfo(ctx context.Context, sctx sessionctx.Context,
 	sessionVars := task.SessionVars
 	execStmts := task.ExecStmts
 	zw := zip.NewWriter(zf)
-	records := generateRecords(task)
+	var records []PlanReplayerStatusRecord
 	defer func() {
 		if err != nil {
 			logutil.BgLogger().Error("dump plan replayer failed", zap.Error(err))
@@ -183,6 +191,12 @@ func DumpPlanReplayerInfo(ctx context.Context, sctx sessionctx.Context,
 		}
 		insertPlanReplayerStatus(ctx, sctx, records)
 	}()
+
+	// Dump SQLMeta
+	if err = dumpSQLMeta(zw, task); err != nil {
+		return err
+	}
+
 	// Dump config
 	if err = dumpConfig(zw); err != nil {
 		return err
@@ -244,10 +258,11 @@ func DumpPlanReplayerInfo(ctx context.Context, sctx sessionctx.Context,
 	}
 
 	if len(task.EncodedPlan) > 0 {
+		records = generateRecords(task)
 		return dumpEncodedPlan(sctx, zw, task.EncodedPlan)
 	}
 	// Dump explain
-	return dumpExplain(sctx, zw, execStmts, task.Analyze)
+	return dumpExplain(sctx, zw, task, &records)
 }
 
 func generateRecords(task *PlanReplayerDumpTask) []PlanReplayerStatusRecord {
@@ -265,6 +280,19 @@ func generateRecords(task *PlanReplayerDumpTask) []PlanReplayerStatusRecord {
 	return records
 }
 
+func dumpSQLMeta(zw *zip.Writer, task *PlanReplayerDumpTask) error {
+	cf, err := zw.Create(planReplayerSQLMeta)
+	if err != nil {
+		return errors.AddStack(err)
+	}
+	varMap := make(map[string]string)
+	varMap[PlanReplayerSQLMetaStartTS] = strconv.FormatUint(task.StartTS, 10)
+	if err := toml.NewEncoder(cf).Encode(varMap); err != nil {
+		return errors.AddStack(err)
+	}
+	return nil
+}
+
 func dumpConfig(zw *zip.Writer) error {
 	cf, err := zw.Create(PlanReplayerConfigFile)
 	if err != nil {
@@ -488,12 +516,12 @@ func dumpEncodedPlan(ctx sessionctx.Context, zw *zip.Writer, encodedPlan string)
 	return nil
 }
 
-func dumpExplain(ctx sessionctx.Context, zw *zip.Writer, execStmts []ast.StmtNode, isAnalyze bool) error {
-	for i, stmtExec := range execStmts {
+func dumpExplain(ctx sessionctx.Context, zw *zip.Writer, task *PlanReplayerDumpTask, records *[]PlanReplayerStatusRecord) error {
+	for i, stmtExec := range task.ExecStmts {
 		sql := stmtExec.Text()
 		var recordSets []sqlexec.RecordSet
 		var err error
-		if isAnalyze {
+		if task.Analyze {
 			// Explain analyze
 			recordSets, err = ctx.(sqlexec.SQLExecutor).Execute(context.Background(), fmt.Sprintf("explain analyze %s", sql))
 			if err != nil {
@@ -522,6 +550,10 @@ func dumpExplain(ctx sessionctx.Context, zw *zip.Writer, execStmts []ast.StmtNod
 				return err
 			}
 		}
+		*records = append(*records, PlanReplayerStatusRecord{
+			OriginSQL: sql,
+			Token:     task.FileName,
+		})
 	}
 	return nil
 }

executor/compiler.go

@@ -157,13 +157,17 @@ func (c *Compiler) Compile(ctx context.Context, stmtNode ast.StmtNode) (_ *ExecS
 		}
 	}
 	if c.Ctx.GetSessionVars().EnablePlanReplayerCapture && !c.Ctx.GetSessionVars().InRestrictedSQL {
-		checkPlanReplayerCaptureTask(c.Ctx, stmtNode)
+		startTS, err := sessiontxn.GetTxnManager(c.Ctx).GetStmtReadTS()
+		if err != nil {
+			return nil, err
+		}
+		checkPlanReplayerCaptureTask(c.Ctx, stmtNode, startTS)
 	}
 
 	return stmt, nil
 }
 
-func checkPlanReplayerCaptureTask(sctx sessionctx.Context, stmtNode ast.StmtNode) {
+func checkPlanReplayerCaptureTask(sctx sessionctx.Context, stmtNode ast.StmtNode, startTS uint64) {
 	dom := domain.GetDomain(sctx)
 	if dom == nil {
 		return
@@ -178,21 +182,22 @@ func checkPlanReplayerCaptureTask(sctx sessionctx.Context, stmtNode ast.StmtNode
 	for _, task := range tasks {
 		if task.SQLDigest == sqlDigest.String() {
 			if task.PlanDigest == "*" || task.PlanDigest == planDigest.String() {
-				sendPlanReplayerDumpTask(sqlDigest.String(), planDigest.String(), sctx, stmtNode)
+				sendPlanReplayerDumpTask(sqlDigest.String(), planDigest.String(), sctx, stmtNode, startTS)
 				return
 			}
 		}
 	}
 }
 
-func sendPlanReplayerDumpTask(sqlDigest, planDigest string, sctx sessionctx.Context, stmtNode ast.StmtNode) {
+func sendPlanReplayerDumpTask(sqlDigest, planDigest string, sctx sessionctx.Context, stmtNode ast.StmtNode, startTS uint64) {
 	stmtCtx := sctx.GetSessionVars().StmtCtx
 	handle := sctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
 	dumpTask := &domain.PlanReplayerDumpTask{
 		PlanReplayerTaskKey: domain.PlanReplayerTaskKey{
 			SQLDigest:  sqlDigest,
 			PlanDigest: planDigest,
 		},
+		StartTS:         startTS,
 		EncodePlan:      GetEncodedPlan,
 		TblStats:        stmtCtx.TableStats,
 		SessionBindings: handle.GetAllBindRecord(),

executor/plan_replayer.go

@@ -31,6 +31,7 @@ import (
 	"github.com/pingcap/tidb/parser/ast"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/sessionctx/variable"
+	"github.com/pingcap/tidb/sessiontxn"
 	"github.com/pingcap/tidb/statistics/handle"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/logutil"
@@ -133,7 +134,12 @@ func (e *PlanReplayerExec) createFile() error {
 func (e *PlanReplayerDumpInfo) dump(ctx context.Context) (err error) {
 	fileName := e.FileName
 	zf := e.File
+	startTS, err := sessiontxn.GetTxnManager(e.ctx).GetStmtReadTS()
+	if err != nil {
+		return err
+	}
 	task := &domain.PlanReplayerDumpTask{
+		StartTS:     startTS,
 		FileName:    fileName,
 		Zf:          zf,
 		SessionVars: e.ctx.GetSessionVars(),