expression: fix the return type of coalesce when arg type is DATE

[xzhangxian1008]

What problem does this PR solve?

Issue Number: close #46475

Problem Summary:

What is changed and how it works?

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.

Fix the return type of coalesce

[tiprow]

Hi @xzhangxian1008. Thanks for your PR.

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[codecov]

Codecov Report

Merging #48032 (8485794) into master (a51ea16) will increase coverage by 1.8222%.
Report is 124 commits behind head on master.
The diff coverage is 89.0909%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48032        +/-   ##
================================================
+ Coverage   71.6425%   73.4647%   +1.8222%     
================================================
  Files          1401       1426        +25     
  Lines        405738     418440     +12702     
================================================
+ Hits         290681     307406     +16725     
+ Misses        95280      92028      -3252     
+ Partials      19777      19006       -771     

Flag	Coverage Δ
integration	43.6800% <83.6363%> (?)
unit	72.1198% <89.0909%> (+0.4773%)	⬆️

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

Components	Coverage Δ
dumpling	53.9874% <ø> (-0.0039%)	⬇️
parser	∅ <ø> (∅)
br	49.1469% <ø> (-3.9002%)	⬇️

[xzhangxian1008]

/cc @windtalker @guo-shaoge

[xzhangxian1008]

/cc @XuHuaiyu

[xzhangxian1008]

/cc @XuHuaiyu @windtalker

[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/test-infra repository.

[hawkingrei]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/expression/OWNERS [windtalker]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-07 03:59:32.341131049 +0000 UTC m=+3530369.928241193: ☑️ agreed by windtalker.
• 2023-11-08 06:03:19.518412094 +0000 UTC m=+3624197.105522251: ☑️ agreed by wshwsh12.

[xzhangxian1008]

/retest

[xzhangxian1008]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #48423.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #48424.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #48425.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #48426.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #48427.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #48428.