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executor: reset groupChecker for StreamAggExec when Close #10615

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merged 3 commits into from
May 29, 2019
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Merged

executor: reset groupChecker for StreamAggExec when Close #10615

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executor: reset groupChecker for StreamAggExec when Close
XuHuaiyu May 28, 2019
6a524d1
Merge branch 'master' into fix_streamagg
ngaut May 29, 2019
a13064e
Merge branch 'master' into fix_streamagg
XuHuaiyu May 29, 2019
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10 changes: 10 additions & 0 deletions executor/aggregate.go
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Original file line number Diff line number Diff line change
Expand Up @@ -789,6 +789,7 @@ func (e *StreamAggExec) Open(ctx context.Context) error {
// Close implements the Executor Close interface.
func (e *StreamAggExec) Close() error {
e.childResult = nil
e.groupChecker.reset()
return e.baseExecutor.Close()
}

Expand Down Expand Up @@ -954,3 +955,12 @@ func (e *groupChecker) meetNewGroup(row chunk.Row) (bool, error) {
}
return !firstGroup, nil
}

func (e *groupChecker) reset() {
if e.curGroupKey != nil {
e.curGroupKey = e.curGroupKey[:0]
}
if e.tmpGroupKey != nil {
e.tmpGroupKey = e.tmpGroupKey[:0]
}
}
11 changes: 11 additions & 0 deletions executor/aggregate_test.go
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Expand Up @@ -710,3 +710,14 @@ func (s *testSuite1) TestIssue10098(c *C) {
tk.MustExec("insert into t values('1', '222'), ('12', '22')")
tk.MustQuery("select group_concat(distinct a, b) from t").Check(testkit.Rows("1222,1222"))
}

func (s *testSuite1) TestIssue10608(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec(`drop table if exists t, s;`)
tk.MustExec("create table t(a int)")
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this test case currently does not cover the bug since it can't reproduce the bug.

we should modify this line to create table t(a int primary key);

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@XuHuaiyu

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@XuHuaiyu XuHuaiyu Oct 23, 2019 •
edited
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What do you mean by it can't reproduce the bug?
@cosven

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@cosven cosven Oct 23, 2019 •
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what I expect
this test case should fail in previous commits(version), such as 3.0.0-beta
it should return error 1105 - subquery returns more than 1 row

what I saw instead
it passed.

What do you mean by it can't reproduce the bug?

this test case can't prove this PR fixes the bug described in issue #10608, because this unittest case will always pass.

tk.MustExec("create table s(a int, b int)")
tk.MustExec("insert into s values(100292, 508931), (120002, 508932)")
tk.MustExec("insert into t values(508931), (508932)")
tk.MustQuery("select (select group_concat(concat(123,'-')) from t where t.a = s.b group by t.a) as t from s;").Check(testkit.Rows("123-", "123-"))

}