*: fix a bug that collation is not handle for text type (#23045)

[ti-srebot]

cherry-pick #23045 to release-4.0
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/23092

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git push [email protected]:ti-srebot/tidb.git pr/23092:release-4.0-6f250b625e2c

---

What problem does this PR solve?

Issue Number: close #23032

Problem Summary:
Need to handle collation for text type.

What is changed and how it works?

Take blob as string. Use the collation to distinguish text from the real blob.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

Release note

• fix a bug that collation is not handle for text type

[ti-srebot]

/run-all-tests

[ti-srebot]

@wjhuang2016 you're already a collaborator in bot's repo.

[wjhuang2016]

/cc @winoros @AilinKid

[AilinKid]

LGTM

[ti-chi-bot]

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[AilinKid]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AilinKid
• winoros

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[wjhuang2016]

/merge

[ti-chi-bot]

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

Commit hash: bc967c8

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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