planner: fix wrong selection push down when having above agg (#27021)

[ti-srebot]

cherry-pick #27021 to release-5.2
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27259

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git push git@github.com:ti-srebot/tidb.git pr/27259:release-5.2-09ebd0d703c1

---

Signed-off-by: lzmhhh123 lzmhhh123@gmail.com

What problem does this PR solve?

Issue Number: close #26496

What is changed and how it works?

How it Works:

Check List

Tests

• Unit test
• Integration test

Side effects

• Performance regression: Consumes more CPU

Release note

fix wrong selection push down when having above agg

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• guo-shaoge
• wshwsh12

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[ti-srebot]

/run-all-tests

[ti-srebot]

@lzmhhh123 you're already a collaborator in bot's repo.

[zanmato1984]

LGTM

[ti-chi-bot]

@zanmato1984: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

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[fzhedu]

/merge

[ti-chi-bot]

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

Commit hash: 9b24110

[ti-chi-bot]

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