planner: fix tidb_enforce_mpp cannot work

[hawkingrei]

What problem does this PR solve?

Issue Number: close #65145

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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

Needs approval from an approver in each of these files:

• OWNERS
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[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.2741%. Comparing base (311b25a) to head (febc8de).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65146        +/-   ##
================================================
- Coverage   70.7286%   68.2741%   -2.4545%     
================================================
  Files          1895       1872        -23     
  Lines        518076     509950      -8126     
================================================
- Hits         366428     348164     -18264     
- Misses       127107     139346     +12239     
+ Partials      24541      22440      -2101     

Flag	Coverage Δ
integration	41.5927% <0.0000%> (-6.5775%)	⬇️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	38.3952% <ø> (-19.8240%)	⬇️

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[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	febc8de	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
pull-unit-test-next-gen	febc8de	link	true	/test pull-unit-test-next-gen
idc-jenkins-ci-tidb/unit-test	febc8de	link	true	/test unit-test

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.