expression: fix infinity loop in timestampadd (#54916)

[ti-chi-bot]

This is an automated cherry-pick of #54916

What problem does this PR solve?

Issue Number: close #54908

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.

Fix the issue that `timestampadd` function enters into infinity loop when the first parameter is 'month' and the second parameter is a negative number.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 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     #54973   +/-   ##
================================================
  Coverage               ?   71.4032%           
================================================
  Files                  ?       1465           
  Lines                  ?     424860           
  Branches               ?          0           
================================================
  Hits                   ?     303364           
  Misses                 ?     100974           
  Partials               ?      20522           

Flag	Coverage Δ
unit	71.4032% <50.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	40.8388% <0.0000%> (?)

[xzhangxian1008]

/retest

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/expression/OWNERS [XuHuaiyu,windtalker]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-29 03:54:33.623667012 +0000 UTC m=+155189.903715084: ☑️ agreed by XuHuaiyu.
• 2024-07-30 08:02:24.513263665 +0000 UTC m=+256460.793311734: ☑️ agreed by windtalker.

[xzhangxian1008]

/retest