planner: remove useless code

[hawkingrei]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

This code starts to be useless at the #43114

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.6791%. Comparing base (815130f) to head (c6570e7).
Report is 34 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61227        +/-   ##
================================================
+ Coverage   73.1358%   73.6791%   +0.5433%     
================================================
  Files          1726       1726                
  Lines        478019     484205      +6186     
================================================
+ Hits         349603     356758      +7155     
+ Misses       106975     105916      -1059     
- Partials      21441      21531        +90     

Flag	Coverage Δ
integration	42.7674% <ø> (?)
unit	72.5001% <ø> (+0.1356%)	⬆️

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

Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.8960% <ø> (-0.6655%)	⬇️

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[hawkingrei]

/retest

[lance6716]

/retest

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-05-22 02:00:23.508873738 +0000 UTC m=+57727.925933302: ☑️ agreed by zimulala.
• 2025-05-23 08:35:11.703070735 +0000 UTC m=+21937.648335544: ☑️ agreed by lance6716.

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, time-and-fate, zimulala

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• pkg/planner/OWNERS [time-and-fate]

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[hawkingrei]

/retest

[tiprow]

@hawkingrei: 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	c6570e7	link	true	/test fast_test_tiprow

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