planner: correct plan when scan tidb related cluster table with KeepOrder (#51922)

[ti-chi-bot]

This is an automated cherry-pick of #51922

What problem does this PR solve?

Issue Number: close #51723

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

[codecov]

Codecov Report

Attention: Patch coverage is 66.03774% with 18 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@896c0c1). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #58848   +/-   ##
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  Coverage               ?   73.6206%           
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  Files                  ?       1097           
  Lines                  ?     353068           
  Branches               ?          0           
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  Hits                   ?     259931           
  Misses                 ?      76389           
  Partials               ?      16748           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, Defined2014

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• OWNERS [AilinKid,Defined2014]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-10 03:53:57.4756929 +0000 UTC m=+498580.764524605: ☑️ agreed by Defined2014.
• 2025-01-10 04:54:47.18426272 +0000 UTC m=+502230.473094464: ☑️ agreed by AilinKid.