excutor: fix the date precision of builtinCastDurationAsStringSig.vecEvalString #23314 #23286 (#23332)

[ti-srebot]

cherry-pick #23332 to release-4.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26970

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git push git@github.com:ti-srebot/tidb.git pr/26970:release-4.0-6e00871551d8

---

What problem does this PR solve?

Issue Number: close #23314 #23286

Problem Summary:

What is changed and how it works?

Proposal: xxx

What's Changed:

How it Works:

Related changes

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression
  • Consumes more CPU
  • Consumes more MEM
• Breaking backward compatibility

Release note

• fix date precision

[ti-chi-bot]

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[ti-chi-bot]

@ti-srebot: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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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]

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

[wzru]

/close

[ti-chi-bot]

@wzru: Closed this PR.

In response to this:

/close

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 kubernetes/test-infra repository.