expression: fix the return type of coalesce when arg type is DATE | tidb-test=pr/2387

[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.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[xzhangxian1008]

/cc @windtalker @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

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.

[wuhuizuo]

please ignore the two aborted CI statuses:

Maybe they are caused by prow bug.

[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-7.1@d61bc29). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #55978   +/-   ##
================================================
  Coverage               ?   73.4861%           
================================================
  Files                  ?       1211           
  Lines                  ?     380820           
  Branches               ?          0           
================================================
  Hits                   ?     279850           
  Misses                 ?      83128           
  Partials               ?      17842           

[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:

• 2024-09-11 00:58:18.769535976 +0000 UTC m=+404368.509959916: ☑️ agreed by windtalker.
• 2024-09-11 02:04:21.163850193 +0000 UTC m=+408330.904274132: ☑️ 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

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.