use method to get PB context

Signed-off-by: Yang Keao <yangkeao@chunibyo.icu>

pkg/executor/distsql.go

@@ -320,7 +320,7 @@ func (e *IndexReaderExecutor) buildKVReq(r []kv.KeyRange) (*kv.Request, error) {
 func (e *IndexReaderExecutor) open(ctx context.Context, kvRanges []kv.KeyRange) error {
 	var err error
 	if e.corColInFilter {
-		e.dagPB.Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.plans)
+		e.dagPB.Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.plans)
 		if err != nil {
 			return err
 		}
@@ -582,14 +582,14 @@ func (e *IndexLookUpExecutor) open(_ context.Context) error {
 
 	var err error
 	if e.corColInIdxSide {
-		e.dagPB.Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.idxPlans)
+		e.dagPB.Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.idxPlans)
 		if err != nil {
 			return err
 		}
 	}
 
 	if e.corColInTblSide {
-		e.tableRequest.Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.tblPlans)
+		e.tableRequest.Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.tblPlans)
 		if err != nil {
 			return err
 		}

pkg/executor/index_merge_reader.go

@@ -167,7 +167,7 @@ func (e *IndexMergeReaderExecutor) Open(_ context.Context) (err error) {
 	e.keyRanges = make([][]kv.KeyRange, 0, len(e.partialPlans))
 	e.initRuntimeStats()
 	if e.isCorColInTableFilter {
-		e.tableRequest.Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.tblPlans)
+		e.tableRequest.Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.tblPlans)
 		if err != nil {
 			return err
 		}
@@ -370,7 +370,7 @@ func (e *IndexMergeReaderExecutor) startPartialIndexWorker(ctx context.Context,
 				if e.isCorColInPartialFilters[workID] {
 					// We got correlated column, so need to refresh Selection operator.
 					var err error
-					if e.dagPBs[workID].Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.partialPlans[workID]); err != nil {
+					if e.dagPBs[workID].Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.partialPlans[workID]); err != nil {
 						syncErr(ctx, e.finished, fetchCh, err)
 						return
 					}
@@ -513,7 +513,7 @@ func (e *IndexMergeReaderExecutor) startPartialTableWorker(ctx context.Context,
 				}
 
 				if e.isCorColInPartialFilters[workID] {
-					if e.dagPBs[workID].Executors, err = builder.ConstructListBasedDistExec(plannercore.GetBuildPBCtx(e.Ctx().GetPlanCtx()), e.partialPlans[workID]); err != nil {
+					if e.dagPBs[workID].Executors, err = builder.ConstructListBasedDistExec(e.Ctx().GetPlanCtx().GetBuildPBCtx(), e.partialPlans[workID]); err != nil {
 						syncErr(ctx, e.finished, fetchCh, err)
 						return
 					}

pkg/executor/internal/builder/builder_utils.go

@@ -60,10 +60,10 @@ func ConstructDAGReq(ctx sessionctx.Context, plans []plannercore.PhysicalPlan, s
 	}
 	if storeType == kv.TiFlash {
 		var executors []*tipb.Executor
-		executors, err = ConstructTreeBasedDistExec(plannercore.GetBuildPBCtx(ctx.GetPlanCtx()), plans[0])
+		executors, err = ConstructTreeBasedDistExec(ctx.GetPlanCtx().GetBuildPBCtx(), plans[0])
 		dagReq.RootExecutor = executors[0]
 	} else {
-		dagReq.Executors, err = ConstructListBasedDistExec(plannercore.GetBuildPBCtx(ctx.GetPlanCtx()), plans)
+		dagReq.Executors, err = ConstructListBasedDistExec(ctx.GetPlanCtx().GetBuildPBCtx(), plans)
 	}
 
 	distsql.SetEncodeType(ctx.GetDistSQLCtx(), dagReq)

pkg/executor/table_reader.go

@@ -121,7 +121,7 @@ func newTableReaderExecutorContext(sctx sessionctx.Context) tableReaderExecutorC
 	pctx := sctx.GetPlanCtx()
 	return tableReaderExecutorContext{
 		dctx:        sctx.GetDistSQLCtx(),
-		buildPBCtx:  plannercore.GetBuildPBCtx(pctx),
+		buildPBCtx:  pctx.GetBuildPBCtx(),
 		pctx:        pctx,
 		ectx:        sctx.GetExprCtx(),
 		getDDLOwner: getDDLOwner,

pkg/planner/context/context.go

@@ -63,6 +63,8 @@ type PlanContext interface {
 	HasDirtyContent(tid int64) bool
 	// AdviseTxnWarmup advises the txn to warm up.
 	AdviseTxnWarmup() error
+	// GetBuildPBCtx returns the context used in `ToPB` method.
+	GetBuildPBCtx() *BuildPBContext
 }
 
 // EmptyPlanContextExtended is used to provide some empty implementations for PlanContext.

pkg/planner/core/physical_plan_test.go

@@ -506,7 +506,7 @@ func TestPhysicalTableScanExtractCorrelatedCols(t *testing.T) {
 		core.PushedDown(sel, ts, []expression.Expression{selected}, 0.1)
 	}
 
-	pb, err := ts.ToPB(core.GetBuildPBCtx(tk.Session().GetPlanCtx()), kv.TiFlash)
+	pb, err := ts.ToPB(tk.Session().GetPlanCtx().GetBuildPBCtx(), kv.TiFlash)
 	require.NoError(t, err)
 	// make sure the pushed down filter condition is correct
 	require.Equal(t, 1, len(pb.TblScan.PushedDownFilterConditions))

pkg/planner/core/util.go

@@ -473,26 +473,7 @@ func EncodeUniqueIndexValuesForKey(ctx sessionctx.Context, tblInfo *model.TableI
 
 // GetPushDownCtx creates a PushDownContext from PlanContext
 func GetPushDownCtx(pctx PlanContext) expression.PushDownContext {
-	return GetPushDownCtxFromBuildPBContext(GetBuildPBCtx(pctx))
-}
-
-// GetBuildPBCtx returns the BuildPBContext from PlanContext
-func GetBuildPBCtx(pctx PlanContext) *BuildPBContext {
-	return &BuildPBContext{
-		ExprCtx: pctx.GetExprCtx(),
-		Client:  pctx.GetClient(),
-
-		TiFlashFastScan:                    pctx.GetSessionVars().TiFlashFastScan,
-		TiFlashFineGrainedShuffleBatchSize: pctx.GetSessionVars().TiFlashFineGrainedShuffleBatchSize,
-
-		// the following fields are used to build `expression.PushDownContext`.
-		// TODO: it'd be better to embed `expression.PushDownContext` in `BuildPBContext`. But `expression` already
-		// depends on this package, so we need to move `expression.PushDownContext` to a standalone package first.
-		GroupConcatMaxLen:  pctx.GetSessionVars().GroupConcatMaxLen,
-		InExplainStmt:      pctx.GetSessionVars().StmtCtx.InExplainStmt,
-		AppendWarning:      pctx.GetSessionVars().StmtCtx.AppendWarning,
-		AppendExtraWarning: pctx.GetSessionVars().StmtCtx.AppendExtraWarning,
-	}
+	return GetPushDownCtxFromBuildPBContext(pctx.GetBuildPBCtx())
 }
 
 // GetPushDownCtxFromBuildPBContext creates a PushDownContext from BuildPBContext

pkg/session/session.go

@@ -2697,6 +2697,32 @@ func (s *session) GetDistSQLCtx() *distsqlctx.DistSQLContext {
 	return dctx.(*distsqlctx.DistSQLContext)
 }
 
+// GetBuildPBCtx returns the context used in `ToPB` method
+func (s *session) GetBuildPBCtx() *planctx.BuildPBContext {
+	vars := s.GetSessionVars()
+	sc := vars.StmtCtx
+
+	bctx := sc.GetOrInitBuildPBCtxFromCache(func() any {
+		return &planctx.BuildPBContext{
+			ExprCtx: s.GetExprCtx(),
+			Client:  s.GetClient(),
+
+			TiFlashFastScan:                    s.GetSessionVars().TiFlashFastScan,
+			TiFlashFineGrainedShuffleBatchSize: s.GetSessionVars().TiFlashFineGrainedShuffleBatchSize,
+
+			// the following fields are used to build `expression.PushDownContext`.
+			// TODO: it'd be better to embed `expression.PushDownContext` in `BuildPBContext`. But `expression` already
+			// depends on this package, so we need to move `expression.PushDownContext` to a standalone package first.
+			GroupConcatMaxLen:  s.GetSessionVars().GroupConcatMaxLen,
+			InExplainStmt:      s.GetSessionVars().StmtCtx.InExplainStmt,
+			AppendWarning:      s.GetSessionVars().StmtCtx.AppendWarning,
+			AppendExtraWarning: s.GetSessionVars().StmtCtx.AppendExtraWarning,
+		}
+	})
+
+	return bctx.(*planctx.BuildPBContext)
+}
+
 func (s *session) AuthPluginForUser(user *auth.UserIdentity) (string, error) {
 	pm := privilege.GetPrivilegeManager(s)
 	authplugin, err := pm.GetAuthPluginForConnection(user.Username, user.Hostname)

pkg/sessionctx/context.go

@@ -119,6 +119,9 @@ type Context interface {
 	// GetDistSQLCtx gets the distsql ctx of the current session
 	GetDistSQLCtx() *distsqlctx.DistSQLContext
 
+	// GetBuildPBCtx gets the ctx used in `ToPB` of the current session
+	GetBuildPBCtx() *planctx.BuildPBContext
+
 	GetSessionManager() util.SessionManager
 
 	// RefreshTxnCtx commits old transaction without retry,

pkg/sessionctx/stmtctx/stmtctx.go

@@ -175,6 +175,13 @@ type StatementContext struct {
 		dctx *distsqlctx.DistSQLContext
 	}
 
+	// buildPBCtxCache is used to persist all variables and tools needed by the `ToPB`
+	// this cache is set on `StatementContext` because it has to be updated after each statement.
+	buildPBCtxCache struct {
+		init sync.Once
+		bctx any
+	}
+
 	// Set the following variables before execution
 	hint.StmtHints
 
@@ -1255,6 +1262,16 @@ func (sc *StatementContext) GetOrInitDistSQLFromCache(create func() *distsqlctx.
 	return sc.distSQLCtxCache.dctx
 }
 
+// GetOrInitBuildPBCtxFromCache returns the `BuildPBContext` inside cache. If it didn't exist, return a new one created by
+// the `create` function. It uses the `any` to avoid cycle dependency.
+func (sc *StatementContext) GetOrInitBuildPBCtxFromCache(create func() any) any {
+	sc.buildPBCtxCache.init.Do(func() {
+		sc.buildPBCtxCache.bctx = create()
+	})
+
+	return sc.buildPBCtxCache.bctx
+}
+
 func newErrCtx(tc types.Context, otherLevels errctx.LevelMap, handler contextutil.WarnHandler) errctx.Context {
 	l := errctx.LevelError
 	if flags := tc.Flags(); flags.IgnoreTruncateErr() {

pkg/util/mock/context.go

@@ -278,6 +278,25 @@ func (c *Context) GetDistSQLCtx() *distsqlctx.DistSQLContext {
 	}
 }
 
+// GetBuildPBCtx returns the `ToPB` context of the session
+func (c *Context) GetBuildPBCtx() *planctx.BuildPBContext {
+	return &planctx.BuildPBContext{
+		ExprCtx: c.GetExprCtx(),
+		Client:  c.GetClient(),
+
+		TiFlashFastScan:                    c.GetSessionVars().TiFlashFastScan,
+		TiFlashFineGrainedShuffleBatchSize: c.GetSessionVars().TiFlashFineGrainedShuffleBatchSize,
+
+		// the following fields are used to build `expression.PushDownContext`.
+		// TODO: it'd be better to embed `expression.PushDownContext` in `BuildPBContext`. But `expression` already
+		// depends on this package, so we need to move `expression.PushDownContext` to a standalone package first.
+		GroupConcatMaxLen:  c.GetSessionVars().GroupConcatMaxLen,
+		InExplainStmt:      c.GetSessionVars().StmtCtx.InExplainStmt,
+		AppendWarning:      c.GetSessionVars().StmtCtx.AppendWarning,
+		AppendExtraWarning: c.GetSessionVars().StmtCtx.AppendExtraWarning,
+	}
+}
+
 // Txn implements sessionctx.Context Txn interface.
 func (c *Context) Txn(bool) (kv.Transaction, error) {
 	return &c.txn, nil