expression: not push invalid cast to tiflash (#28458)

[ti-srebot]

cherry-pick #28458 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/28652

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

git push git@github.com:ti-srebot/tidb.git pr/28652:release-5.1-36d0b4067dc5

---

What problem does this PR solve?

Issue Number: close #23907

Problem Summary:
As the issue described.

What is changed and how it works?

Proposal: xxx

What's Changed:

How it Works:

The root cause of this error is for cast function like castIntAsInt, TiDB's implementation is castIntAsInt64, so in order to be consistent with TiDB, TiFlash's cast only support cast something to Int64. However, the return type of castIntAsInt is not always Int64, if the return type is Int32, TiFlash will try to cast something to Int32, this will cause TiFlash throw tidb_cast to Int32 is not supported error. This pr check the return type of cast function, and only allow it to be pushed down to TiFlash if supported.

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

Fix unexpected error like `tidb_cast to Int32 is not supported` when unsupported cast is pushed down to TiFlash

[ti-chi-bot]

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

• https://prow.tidb.io/command-help#cherrypick
• https://book.prow.tidb.net/#/plugins/cherrypicker

You can find more details at:

• https://internals.tidb.io/t/topic/785