expression: fix the return type of coalesce when arg type is DATE | tidb-test=pr/2386

[xzhangxian1008]

What problem does this PR solve?

cherry-pick of #48032

Issue Number: close #46475

Problem Summary:

What changed and how does it work?

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

[tiprow]

Hi @xzhangxian1008. Thanks for your PR.

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[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, wshwsh12

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-10 05:21:06.36998704 +0000 UTC m=+333736.110410979: ☑️ agreed by windtalker.
• 2024-09-10 06:11:31.547245481 +0000 UTC m=+336761.287669417: ☑️ agreed by wshwsh12.

[xzhangxian1008]

/retest

[tiprow]

@xzhangxian1008: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[xzhangxian1008]

/retest

[tiprow]

@xzhangxian1008: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[xzhangxian1008]

/retest

[tiprow]

@xzhangxian1008: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[codecov]

Codecov Report

Attention: Patch coverage is 81.21212% with 31 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@9815b45). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #55969   +/-   ##
================================================
  Coverage               ?   73.6602%           
================================================
  Files                  ?       1097           
  Lines                  ?     352858           
  Branches               ?          0           
================================================
  Hits                   ?     259916           
  Misses                 ?      76246           
  Partials               ?      16696           

[xzhangxian1008]

/retest

[tiprow]

@xzhangxian1008: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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-sigs/prow repository.