planner: check whether plan-cache is disabled each time when getting plan from the plan cache (#49373)

[ti-chi-bot]

This is an automated cherry-pick of #49373

What problem does this PR solve?

Issue Number: close #49344

Problem Summary: planner: check whether plan-cache is disabled each time when getting plan from the plan cache

What changed and how does it work?

Check List

Tests

• [x] 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[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 08:13:28.486522478 +0000 UTC m=+863297.234145585: :ballot_box_with_check: agreed by fixdb.
• 2024-02-26 10:41:24.001506656 +0000 UTC m=+872172.749129784: :ballot_box_with_check: agreed by qw4990.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (release-7.1@e091ee5). Click here to learn what that means. The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #49386   +/-   ##
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  Misses                 ?      82870           
  Partials               ?      17749           

[qw4990]

/retest

[qw4990]

/test mysql-test

[tiprow[bot]]

@qw4990: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test mysql-test

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/test-infra repository.

[qw4990]

/test mysql-test

[tiprow[bot]]

@qw4990: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test mysql-test

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/test-infra repository.