planner: fix data race in the TestInlineProjection4HashJoinIssue15316

executor/join_test.go

@@ -2149,8 +2149,8 @@ func TestIssue11390(t *testing.T) {
 }
 
 func TestOuterTableBuildHashTableIsuse13933(t *testing.T) {
-	plannercore.ForceUseOuterBuild4Test = true
-	defer func() { plannercore.ForceUseOuterBuild4Test = false }()
+	plannercore.ForceUseOuterBuild4Test.Store(true)
+	defer func() { plannercore.ForceUseOuterBuild4Test.Store(false) }()
 	store := testkit.CreateMockStore(t)
 	tk := testkit.NewTestKit(t, store)
 	tk.MustExec("use test")
@@ -2235,8 +2235,8 @@ func TestIssue14514(t *testing.T) {
 }
 
 func TestOuterMatchStatusIssue14742(t *testing.T) {
-	plannercore.ForceUseOuterBuild4Test = true
-	defer func() { plannercore.ForceUseOuterBuild4Test = false }()
+	plannercore.ForceUseOuterBuild4Test.Store(true)
+	defer func() { plannercore.ForceUseOuterBuild4Test.Store(false) }()
 	store := testkit.CreateMockStore(t)
 	tk := testkit.NewTestKit(t, store)
 	tk.MustExec("use test")
@@ -2262,8 +2262,8 @@ func TestInlineProjection4HashJoinIssue15316(t *testing.T) {
 	// Two necessary factors to reproduce this issue:
 	// (1) taking HashLeftJoin, i.e., letting the probing tuple lay at the left side of joined tuples
 	// (2) the projection only contains a part of columns from the build side, i.e., pruning the same probe side
-	plannercore.ForcedHashLeftJoin4Test = true
-	defer func() { plannercore.ForcedHashLeftJoin4Test = false }()
+	plannercore.ForcedHashLeftJoin4Test.Store(true)
+	defer func() { plannercore.ForcedHashLeftJoin4Test.Store(false) }()
 	store := testkit.CreateMockStore(t)
 	tk := testkit.NewTestKit(t, store)
 	tk.MustExec("use test")
@@ -2595,9 +2595,9 @@ func TestIssue20270(t *testing.T) {
 	err := tk.QueryToErr("select /*+ TIDB_HJ(t, t1) */ * from t left join t1 on t.c1 = t1.c1 where t.c1 = 1 or t1.c2 > 20")
 	require.Equal(t, executor.ErrQueryInterrupted, err)
 	require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/executor/killedInJoin2Chunk"))
-	plannercore.ForceUseOuterBuild4Test = true
+	plannercore.ForceUseOuterBuild4Test.Store(true)
 	defer func() {
-		plannercore.ForceUseOuterBuild4Test = false
+		plannercore.ForceUseOuterBuild4Test.Store(false)
 	}()
 	err = failpoint.Enable("github.com/pingcap/tidb/executor/killedInJoin2ChunkForOuterHashJoin", "return(true)")
 	require.NoError(t, err)

planner/core/exhaust_physical_plans.go

@@ -38,6 +38,7 @@ import (
 	"github.com/pingcap/tidb/util/plancodec"
 	"github.com/pingcap/tidb/util/ranger"
 	"github.com/pingcap/tidb/util/set"
+	"go.uber.org/atomic"
 	"go.uber.org/zap"
 	"golang.org/x/exp/slices"
 )
@@ -366,11 +367,11 @@ func (p *PhysicalMergeJoin) initCompareFuncs() {
 
 // ForceUseOuterBuild4Test is a test option to control forcing use outer input as build.
 // TODO: use hint and remove this variable
-var ForceUseOuterBuild4Test = false
+var ForceUseOuterBuild4Test = atomic.NewBool(false)
 
 // ForcedHashLeftJoin4Test is a test option to force using HashLeftJoin
 // TODO: use hint and remove this variable
-var ForcedHashLeftJoin4Test = false
+var ForcedHashLeftJoin4Test = atomic.NewBool(false)
 
 func (p *LogicalJoin) getHashJoins(prop *property.PhysicalProperty) []PhysicalPlan {
 	if !prop.IsSortItemEmpty() { // hash join doesn't promise any orders
@@ -381,21 +382,21 @@ func (p *LogicalJoin) getHashJoins(prop *property.PhysicalProperty) []PhysicalPl
 	case SemiJoin, AntiSemiJoin, LeftOuterSemiJoin, AntiLeftOuterSemiJoin:
 		joins = append(joins, p.getHashJoin(prop, 1, false))
 	case LeftOuterJoin:
-		if ForceUseOuterBuild4Test {
+		if ForceUseOuterBuild4Test.Load() {
 			joins = append(joins, p.getHashJoin(prop, 1, true))
 		} else {
 			joins = append(joins, p.getHashJoin(prop, 1, false))
 			joins = append(joins, p.getHashJoin(prop, 1, true))
 		}
 	case RightOuterJoin:
-		if ForceUseOuterBuild4Test {
+		if ForceUseOuterBuild4Test.Load() {
 			joins = append(joins, p.getHashJoin(prop, 0, true))
 		} else {
 			joins = append(joins, p.getHashJoin(prop, 0, false))
 			joins = append(joins, p.getHashJoin(prop, 0, true))
 		}
 	case InnerJoin:
-		if ForcedHashLeftJoin4Test {
+		if ForcedHashLeftJoin4Test.Load() {
 			joins = append(joins, p.getHashJoin(prop, 1, false))
 		} else {
 			joins = append(joins, p.getHashJoin(prop, 1, false))
@@ -1327,11 +1328,12 @@ loopOtherConds:
 }
 
 // removeUselessEqAndInFunc removes the useless eq/in conditions. It's designed for the following case:
-//   t1 join t2 on t1.a=t2.a and t1.c=t2.c where t1.b > t2.b-10 and t1.b < t2.b+10 there's index(a, b, c) on t1.
-//   In this case the curIdxOff2KeyOff is [0 -1 1] and the notKeyEqAndIn is [].
-//   It's clearly that the column c cannot be used to access data. So we need to remove it and reset the IdxOff2KeyOff to
-//   [0 -1 -1].
-//   So that we can use t1.a=t2.a and t1.b > t2.b-10 and t1.b < t2.b+10 to build ranges then access data.
+//
+//	t1 join t2 on t1.a=t2.a and t1.c=t2.c where t1.b > t2.b-10 and t1.b < t2.b+10 there's index(a, b, c) on t1.
+//	In this case the curIdxOff2KeyOff is [0 -1 1] and the notKeyEqAndIn is [].
+//	It's clearly that the column c cannot be used to access data. So we need to remove it and reset the IdxOff2KeyOff to
+//	[0 -1 -1].
+//	So that we can use t1.a=t2.a and t1.b > t2.b-10 and t1.b < t2.b+10 to build ranges then access data.
 func (ijHelper *indexJoinBuildHelper) removeUselessEqAndInFunc(idxCols []*expression.Column, notKeyEqAndIn []expression.Expression, _ []*expression.Column) (usefulEqAndIn, uselessOnes []expression.Expression) {
 	ijHelper.curPossibleUsedKeys = make([]*expression.Column, 0, len(idxCols))
 	for idxColPos, notKeyColPos := 0, 0; idxColPos < len(idxCols); idxColPos++ {