planner: simplify datasource's pointer receiver member function.

[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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[AilinKid]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.0454%. Comparing base (c74a233) to head (b327024).
Report is 25 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55474        +/-   ##
================================================
+ Coverage   74.9176%   75.0454%   +0.1277%     
================================================
  Files          1576       1577         +1     
  Lines        365707     443642     +77935     
================================================
+ Hits         273979     332933     +58954     
- Misses        71965      90487     +18522     
- Partials      19763      20222       +459     

Flag	Coverage Δ
integration	75.8045% <100.0000%> (?)
unit	72.0211% <100.0000%> (-1.8870%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (-2.2327%)	⬇️
parser	∅ <ø> (∅)
br	52.6563% <ø> (+4.8379%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/planner/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-19 03:24:22.253383192 +0000 UTC m=+149457.387833312: ☑️ agreed by qw4990.
• 2024-08-19 03:27:55.106657658 +0000 UTC m=+149670.241107803: ☑️ agreed by hawkingrei.