planner: handle other-conditions from subqueries correctly when constructing IndexJoin (#25817)

[ti-srebot]

cherry-pick #25817 to release-5.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25819

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

git push [email protected]:ti-srebot/tidb.git pr/25819:release-5.1-a0b97b0c962d

---

What problem does this PR solve?

Issue Number: close #25799

Problem Summary: planner: handle other-conditions from subqueries correctly when constructing IndexJoin

What is changed and how it works?

When constructing IndexJoin, TiDB extracts equal expressions from other-conditions and converts them into eq-conditions to build hash keys.

If these equal expressions are from some [not] in sub-queries, this conversation may lead to wrong results since IndexJoin cannot deal with NULL correctly in this case.

This PR skips this conversation for equal expressions from [not] in sub-queries.

Check List

Tests

• Unit test

Release note

• planner: handle other-conditions from subqueries correctly when constructing IndexJoin

[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 you're already a collaborator in bot's repo.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• eurekaka
• winoros

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[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 6f00de1

[qw4990]

/merge

[qw4990]

/merge

[qw4990]

@zhouqiang-cl

[qw4990]

Please help me approve this PR again @time-and-fate @winoros @eurekaka

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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