planner: remove some useless binding code

[qw4990]

What problem does this PR solve?

Issue Number: ref #51347

Problem Summary: planner: refactor some code related to binding

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]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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

[LGTM Timeline notifier]

Timeline:

• 2025-02-17 07:20:18.152128735 +0000 UTC m=+859460.548350797: ☑️ agreed by hawkingrei.
• 2025-02-17 07:25:42.936646696 +0000 UTC m=+859785.332868758: ☑️ agreed by AilinKid.

[codecov]

Codecov Report

Attention: Patch coverage is 81.57895% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.5146%. Comparing base (baf1600) to head (d210195).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59581        +/-   ##
================================================
+ Coverage   73.0099%   73.5146%   +0.5046%     
================================================
  Files          1694       1694                
  Lines        468320     468296        -24     
================================================
+ Hits         341920     344266      +2346     
+ Misses       105368     103054      -2314     
+ Partials      21032      20976        -56     

Flag	Coverage Δ
integration	42.8141% <71.0526%> (?)
unit	72.3088% <81.5789%> (+0.0956%)	⬆️

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	45.2368% <ø> (+0.0169%)	⬆️

[hawkingrei]

/retest