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

[ti-srebot]

cherry-pick #28458 to release-5.2
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/28654

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

git push git@github.com:ti-srebot/tidb.git pr/28654:release-5.2-36d0b4067dc5

---

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• XuHuaiyu
• fzhedu

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[zimulala]

PTLA @fzhedu @lzmhhh123

[zimulala]

PTLA @fzhedu @lzmhhh123

[fzhedu]

/LGTM

[fzhedu]

/merge

[ti-chi-bot]

@fzhedu: /merge in this pull request requires 2 approval(s).

In response to this:

/merge

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[zhouqiang-cl]

/merge

[ti-chi-bot]

@zhouqiang-cl: /merge in this pull request requires 2 approval(s).

In response to this:

/merge

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[XuHuaiyu]

LGTM

[zhouqiang-cl]

/merge

[ti-chi-bot]

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

Commit hash: 58f66ee

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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