planner: simplify the indexJoinBuildHelper structure

[qw4990]

What problem does this PR solve?

Issue Number: ref #54057

Problem Summary: planner: simplify the indexJoinBuildHelper structure

What changed and how does it work?

ONLY REFACTORYING, 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]

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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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Needs approval from an approver in each of these files:

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-02 03:42:59.982360493 +0000 UTC m=+60977.201122139: ☑️ agreed by AilinKid.
• 2024-08-02 03:43:18.629433639 +0000 UTC m=+60995.848195246: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 478 lines in your changes missing coverage. Please review.

Project coverage is 73.3062%. Comparing base (2945819) to head (1a40bd7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55150        +/-   ##
================================================
+ Coverage   72.8786%   73.3062%   +0.4275%     
================================================
  Files          1563       1564         +1     
  Lines        439023     439342       +319     
================================================
+ Hits         319954     322065      +2111     
+ Misses        99444      97485      -1959     
- Partials      19625      19792       +167     

Flag	Coverage Δ
integration	19.7029% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9378% <ø> (ø)
parser	∅ <ø> (∅)
br	46.1474% <ø> (+0.2540%)	⬆️