planner: refactor some code of binding cache

[qw4990]

What problem does this PR solve?

Issue Number: ref #51347

Problem Summary: planner: refactor some code of binding cache

What changed and how does it work?

planner: refactor some code of binding cache

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 @qw4990. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 88.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 73.5401%. Comparing base (0c22a2d) to head (1a19390).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58515        +/-   ##
================================================
+ Coverage   73.5156%   73.5401%   +0.0244%     
================================================
  Files          1681       1681                
  Lines        464346     464348         +2     
================================================
+ Hits         341367     341482       +115     
+ Misses       102149     102033       -116     
- Partials      20830      20833         +3     

Flag	Coverage Δ
integration	43.1872% <83.0000%> (?)
unit	72.2625% <88.0000%> (-0.0107%)	⬇️

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	45.7625% <ø> (+0.0059%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• pkg/bindinfo/OWNERS [AilinKid,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-25 02:50:12.573264639 +0000 UTC m=+1616402.662067181: ☑️ agreed by AilinKid.
• 2024-12-25 04:00:21.465569468 +0000 UTC m=+1620611.554372011: ☑️ agreed by hawkingrei.