types: fix type merge about bit type (#23857)

[ti-srebot]

cherry-pick #23857 to release-4.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24026

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---

Signed-off-by: lzmhhh123 lzmhhh123@gmail.com<!-- Thank you for contributing to TiDB!

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1. pkg [, pkg2, pkg3]: what's changed
2. *: what's changed

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What problem does this PR solve?

Issue Number: close #23832

What is changed and how it works?

How it Works: make type merge infer for bit column compatible with MySQL 8.0

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test

Release note

• fix type merge about bit type.

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[ichn-hu]

@lzmhhh123 please resove conflicts

[zhouqiang-cl]

/merge

[ti-chi-bot]

@zhouqiang-cl: /merge in this pull request requires 2 /lgtm.

In response to this:

/merge

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[lzmhhh123]

/run-all-tests

[XuHuaiyu]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• XuHuaiyu
• ichn-hu

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[lzmhhh123]

/merge

[ti-chi-bot]

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

Commit hash: cc247a4

[XuHuaiyu]

/merge

[XuHuaiyu]

/merge

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@ti-srebot: Your PR was out of date, I have automatically updated it for you.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

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.