executor: fix a bug that cte.iterOutTbl did not close correctly (#26129)

[ti-srebot]

cherry-pick #26129 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26148

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/26148:release-5.1-7ee78d1e35b9

---

Signed-off-by: guo-shaoge shaoge1994@163.com

What problem does this PR solve?

Issue Number: close #26112

Problem Summary: cte.iterOutTbl didn't close correctly. When recursiveExec is nil, cte.iterOutTbl should not be closed.

What is changed and how it works?

What's Changed:

1. In builder.go, if recursiveExec is nil, donot create iterOutTbl.
2. In CTEExec.Next(), if recursiveExec is nil, donot setup memory tracker for iterOutTbl.
3. In CTEExec.Close(), if recursiveExec is nil, donot close iterOutTbl.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

• executor: fix a bug that cte.iterOutTbl did not close correctly

[ti-srebot]

/run-all-tests

[ti-srebot]

@guo-shaoge you're already a collaborator in bot's repo.

[guo-shaoge]

@lzmhhh123 ptal

[guo-shaoge]

@lzmhhh123 ptal~

[guo-shaoge]

/run-integration-common-test
/run-common-test
/run-integration-copr-test

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lzmhhh123
• wjhuang2016

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[wjhuang2016]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cdb9c42

[AilinKid]

/merge

[ti-chi-bot]

@AilinKid: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

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/merge

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