planner: introduce hash collision consideration on group expression de-duplication

[AilinKid]

What problem does this PR solve?

Issue Number: ref #51664

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 @AilinKid. Thanks for your PR.

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[hawkingrei]

/ok-to-test

[hawkingrei]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.6429%. Comparing base (8a80a41) to head (eb6f62b).
Report is 16 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58354        +/-   ##
================================================
+ Coverage   73.2172%   73.6429%   +0.4256%     
================================================
  Files          1679       1679                
  Lines        462451     464669      +2218     
================================================
+ Hits         338594     342196      +3602     
+ Misses       103079     101646      -1433     
- Partials      20778      20827        +49     

Flag	Coverage Δ
integration	43.2082% <ø> (?)
unit	72.3774% <90.0000%> (+0.0218%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	46.0170% <ø> (+0.0060%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

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• OWNERS [hawkingrei,qw4990]
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-17 10:51:51.179951588 +0000 UTC m=+954101.268754131: ☑️ agreed by hawkingrei.
• 2024-12-18 03:07:18.718688134 +0000 UTC m=+1012628.807490676: ☑️ agreed by qw4990.