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planner: fix nil pointer at expression.(*CorrelatedColumn).Eval (#42789) #48976

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2 changes: 2 additions & 0 deletions planner/core/logical_plan_builder.go
Original file line number Diff line number Diff line change
Expand Up @@ -287,6 +287,7 @@ func (b *PlanBuilder) buildAggregation(ctx context.Context, p LogicalPlan, aggFu
if _, ok = b.correlatedAggMapper[aggFuncList[j]]; !ok {
b.correlatedAggMapper[aggFuncList[j]] = &expression.CorrelatedColumn{
Column: *schema4Agg.Columns[aggIndexMap[j]],
Data: new(types.Datum),
}
}
b.correlatedAggMapper[aggFunc] = b.correlatedAggMapper[aggFuncList[j]]
Expand All @@ -308,6 +309,7 @@ func (b *PlanBuilder) buildAggregation(ctx context.Context, p LogicalPlan, aggFu
if _, ok := correlatedAggMap[aggFunc]; ok {
b.correlatedAggMapper[aggFunc] = &expression.CorrelatedColumn{
Column: column,
Data: new(types.Datum),
}
}
}
Expand Down
25 changes: 25 additions & 0 deletions planner/core/prepare_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -2807,3 +2807,28 @@ func TestIssue37901(t *testing.T) {
tk.MustExec(`execute st1 using @t`)
tk.MustQuery(`select count(*) from t4`).Check(testkit.Rows("2"))
}

func TestIssue42739(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)

tk.MustExec(`use test`)
tk.MustExec(`drop table if exists t0;`)
tk.MustExec(`CREATE TABLE t0 (c1 double, c2 double);`)
tk.MustExec(`select
exists (
select
subq_2.c0 as c8
from
(select
ref_153.c1 as c0
from
t0 as ref_153
group by ref_153.c1 having 0 <> (
select 1
from
t0 as ref_173
where count(ref_153.c2) = avg(ref_153.c2)
order by c1 desc limit 1)) as subq_2
) as c10;`)
}