fix

planner/core/physical_plan_test.go

@@ -1541,12 +1541,12 @@ func (s *testPlanSuite) TestIndexJoinHint(c *C) {
 	}{
 		{
 			sql:     "select /*+ TIDB_INLJ(t1) */ t1.a, t2.a, t3.a from t t1, t t2, t t3 where t1.a = t2.a and t2.a = t3.a;",
-			best:    "MergeInnerJoin{TableReader(Table(t))->IndexJoin{TableReader(Table(t))->TableReader(Table(t))}(test.t2.a,test.t1.a)}(test.t3.a,test.t2.a)->Projection",
+			best:    "IndexMergeJoin{TableReader(Table(t))->IndexMergeJoin{TableReader(Table(t))->TableReader(Table(t))}(test.t2.a,test.t1.a)}(test.t2.a,test.t3.a)->Projection",
 			warning: "",
 		},
 		{
 			sql:     "select /*+ TIDB_INLJ(t1) */ t1.b, t2.a from t t1, t t2 where t1.b = t2.a;",
-			best:    "LeftHashJoin{TableReader(Table(t))->TableReader(Table(t))}(test.t1.b,test.t2.a)",
+			best:    "IndexMergeJoin{TableReader(Table(t))->TableReader(Table(t))}(test.t1.b,test.t2.a)",
 			warning: "[planner:1815]Optimizer Hint /*+ TIDB_INLJ(t1) */ is inapplicable",
 		},
 	}

planner/core/physical_plans.go

@@ -251,8 +251,6 @@ type PhysicalIndexJoin struct {
 type PhysicalIndexMergeJoin struct {
 	PhysicalIndexJoin
 
-	// IsMergejoin represents whether the index join is index merge join. NeedOuterSort, CompareFuncs and OuterCompareFuncs are
-	// the properties of index merge join.
 	NeedOuterSort     bool
 	CompareFuncs      []expression.CompareFunc
 	OuterCompareFuncs []expression.CompareFunc