planner: remove unnecessary pointer receiver function of datasource.

[AilinKid]

What problem does this PR solve?

Issue Number: ref #51664, ref #52714

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 @AilinKid. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.

Project coverage is 75.6733%. Comparing base (99180a8) to head (60fcda6).
Report is 18 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55556        +/-   ##
================================================
+ Coverage   72.9575%   75.6733%   +2.7157%     
================================================
  Files          1577       1580         +3     
  Lines        440885     450768      +9883     
================================================
+ Hits         321659     341111     +19452     
+ Misses        99480      89621      -9859     
- Partials      19746      20036       +290     

Flag	Coverage Δ
integration	50.2108% <89.7435%> (?)
unit	75.0072% <89.7435%> (+2.9746%)	⬆️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.6010% <ø> (+6.6551%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

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Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,qw4990]
• pkg/planner/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-22 04:38:26.585716656 +0000 UTC m=+413101.720166776: ☑️ agreed by hawkingrei.
• 2024-08-22 07:06:11.870611006 +0000 UTC m=+421967.005061138: ☑️ agreed by qw4990.

[AilinKid]

/test check-dev

[tiprow]

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/test check-dev

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[AilinKid]

/ok-to-test