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 [email protected]<!-- Thank you for contributing to TiDB!

PR Title Format:

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@ti-srebot: Your PR was out of date, I have automatically updated it for you.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

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