expression: push down left/right/abs to tiflash (#25018)

[ti-srebot]

cherry-pick #25018 to release-5.0
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/25133

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

git push git@github.com:ti-srebot/tidb.git pr/25133:release-5.0-99b1fa56b604

---

What problem does this PR solve?

Issue Number: close pingcap/tiflash#1943, pingcap/tiflash#1937

Problem Summary: push down left()/right()/abs() for tiflash

What is changed and how it works?

Proposal: xxx

What's Changed:

How it Works:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Integration test (done on tiflash)
• Manual test (add detailed scripts or steps below)

Side effects

• Performance regression
  • Consumes more CPU
  • Consumes more MEM
• Breaking backward compatibility

Release note

• push down left/right/abs to tiflash

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[fzhedu]

/run-all-tests

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hanfei1991
• ichn-hu

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[ichn-hu]

/merge

[ti-chi-bot]

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

Commit hash: 65db2f0

[fzhedu]

/merge

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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