planner: fix get wrong planer for expand

[hawkingrei]

What problem does this PR solve?

Issue Number: close #56218

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

[ti-chi-bot]

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Tests

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.8323%. Comparing base (c56694c) to head (70e88c7).
Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #56397        +/-   ##
================================================
+ Coverage   73.3670%   74.8323%   +1.4652%     
================================================
  Files          1622       1623         +1     
  Lines        447161     447146        -15     
================================================
+ Hits         328069     334610      +6541     
+ Misses        98984      91999      -6985     
- Partials      20108      20537       +429     

Flag	Coverage Δ
integration	29.0700% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	52.2876% <54.5454%> (+6.7811%)	⬆️

[tiprow]

@hawkingrei: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	70e88c7	link	true	/test fast_test_tiprow

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[ti-chi-bot]

@hawkingrei: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	70e88c7	link	true	/test check-dev
idc-jenkins-ci-tidb/unit-test	70e88c7	link	true	/test unit-test

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