expression: truncate time part for current_date columns (#54045)

[ti-chi-bot]

This is an automated cherry-pick of #54045

What problem does this PR solve?

Issue Number: close #53746

Problem Summary:

When TiDB uses current_date as default value, "hour:minuate:second" is not truncated correctly. As a result, the queries with equal condition cannot match.

What changed and how does it work?

Truncate time part for current_date.

Check List

Tests

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

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[joechenrh]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.1@cc04dd7). Learn more about missing BASE report.

Additional details and impacted files

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##             release-7.1     #56890   +/-   ##
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  Coverage               ?   73.4689%           
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  Lines                  ?     381327           
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  Hits                   ?     280157           
  Misses                 ?      83278           
  Partials               ?      17892           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tangenta

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• OWNERS [Defined2014,tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-11 06:14:34.900616843 +0000 UTC m=+250437.091485839: ☑️ agreed by tangenta.
• 2024-11-11 06:15:38.34453498 +0000 UTC m=+250500.535403976: ☑️ agreed by Defined2014.