executor: fix CTE goroutine leak when exceeds mem quota (#50828)

[ti-chi-bot]

This is an automated cherry-pick of #50828

What problem does this PR solve?

Issue Number: close #50337

Problem Summary:

1. when child.Close() return error, there may leaking resource.
2. when seedExec.Open() return succ and recursiveExec.Open() returns error, and if this cte is shared by multiple operators, other operator may open seedExec again, which cause resource leaking.

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

drop table if exists t, t1, t2;
create table t (id int,name varchar(10));
insert into t values(1,'tt');
create table t1(id int,name varchar(10),name1 varchar(10),name2 varchar(10));
insert into t1 values(1,'tt','ttt','tttt'),(2,'dd','ddd','dddd');
create table t2(id int,name varchar(10),name1 varchar(10),name2 varchar(10),`date1` date);
insert into t2 values(1,'tt','ttt','tttt','2099-12-31'),(2,'dd','ddd','dddd','2099-12-31');
set tidb_mem_quota_query = 7000;
run cte sql for 2000 times (check https://github.com/pingcap/tidb/issues/50337 for detailed sql)

curl 'http://127.0.0.1:10080/debug/zip?seconds=5' --output debug4.zip and search copIteratorTaskSender to check if any goroutine leak.

• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

fix CTE goroutine leak when child.Close() return error

[ti-chi-bot]

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