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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,tangenta]
• pkg/expression/OWNERS [XuHuaiyu]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-02 08:28:07.281568731 +0000 UTC m=+78084.500330335: ☑️ agreed by tangenta.
• 2024-08-02 08:30:07.633257012 +0000 UTC m=+78204.852018619: ☑️ agreed by XuHuaiyu.

[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-8.1@42b624c). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #54946   +/-   ##
================================================
  Coverage               ?   71.6885%           
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  Files                  ?       1466           
  Lines                  ?     426604           
  Branches               ?          0           
================================================
  Hits                   ?     305826           
  Misses                 ?     100201           
  Partials               ?      20577           

Flag	Coverage Δ
unit	71.6885% <72.7272%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	57.8032% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.9842% <0.0000%> (?)

[tangenta]

/retest

[tangenta]

/retest

[tangenta]

/retest

[tangenta]

/retest

[Ivy-YinSu]

/test unit-test

[tiprow]

@Ivy-YinSu: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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