planner, gcworker, executor: remove unused code

[zimulala]

What problem does this PR solve?

Issue Number: close #61967

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 @zimulala. Thanks for your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.4755%. Comparing base (80c817a) to head (29d0acb).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64496        +/-   ##
================================================
+ Coverage   72.6924%   74.4755%   +1.7831%     
================================================
  Files          1866       1889        +23     
  Lines        506215     514338      +8123     
================================================
+ Hits         367980     383056     +15076     
+ Misses       115858     107422      -8436     
- Partials      22377      23860      +1483     

Flag	Coverage Δ
integration	48.3690% <ø> (?)
unit	72.5340% <ø> (+0.2684%)	⬆️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	63.1697% <ø> (+16.9910%)	⬆️

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[zimulala]

/retest

[tiprow]

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

In response to this:

/retest

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: GMHDBJD
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Needs approval from an approver in each of these files:

• OWNERS [GMHDBJD]
• pkg/ddl/OWNERS [GMHDBJD]
• pkg/executor/importer/OWNERS [GMHDBJD]
• pkg/planner/OWNERS

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-11-17 03:26:52.299135 +0000 UTC m=+1277461.742164869: ☑️ agreed by GMHDBJD.