planner: fix max-one-row will hash equals to each other because of no elements inside.

[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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[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 15 lines in your changes missing coverage. Please review.

Project coverage is 73.4522%. Comparing base (70f5218) to head (f98d66d).
Report is 14 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57797        +/-   ##
================================================
+ Coverage   72.8287%   73.4522%   +0.6234%     
================================================
  Files          1677       1677                
  Lines        464233     467278      +3045     
================================================
+ Hits         338095     343226      +5131     
+ Misses       105234     103211      -2023     
+ Partials      20904      20841        -63     

Flag	Coverage Δ
integration	43.4174% <0.0000%> (?)
unit	72.2740% <58.3333%> (+0.0459%)	⬆️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.2665% <ø> (-0.4341%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/planner/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-28 10:36:30.515301564 +0000 UTC m=+719178.134956080: ☑️ agreed by hawkingrei.
• 2024-11-28 11:42:50.298819849 +0000 UTC m=+723157.918474364: ☑️ agreed by qw4990.

[tiprow]

@AilinKid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	ba661e1	link	true	/test fast_test_tiprow

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[AilinKid]

/retest-required

[tiprow]

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

In response to this:

/retest-required

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