planner: refactor some internal hint structures

[qw4990]

What problem does this PR solve?

Issue Number: ref #48875

Problem Summary: planner: refactor some internal hint structures

What changed and how does it work?

ONLY REFACTOR, NO LOGICAL CHANGE

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

Merging #50720 (d17d4ad) into master (c852515) will decrease coverage by 14.7457%.
The diff coverage is 99.1869%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50720         +/-   ##
=================================================
- Coverage   70.3596%   55.6139%   -14.7457%     
=================================================
  Files          1456       1567        +111     
  Lines        420835     588196     +167361     
=================================================
+ Hits         296098     327119      +31021     
- Misses       104395     238325     +133930     
- Partials      20342      22752       +2410     

Flag	Coverage Δ
integration	36.6924% <99.1869%> (?)

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	56.5473% <ø> (+5.9772%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-25 07:13:54.945532772 +0000 UTC m=+1031276.509830462: ☑️ agreed by hawkingrei.
• 2024-01-25 07:32:36.28603429 +0000 UTC m=+1032397.850331994: ☑️ agreed by hi-rustin.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[qw4990]

/test unit-test

[tiprow]

@qw4990: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/test unit-test

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