planner: optimize the schema check phase in the plan cache path

[Reminiscent]

What problem does this PR solve?

Issue Number: ref #65117

Problem Summary:
optimize the schema check phase in the plan cache path

What changed and how does it work?

The cache key hashing logic is also optimized to reduce overhead in the hot path.

Check List

Tests
use the existing tests. Benchmark TBD.

• 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]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ti-chi-bot]

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[tiprow]

Hi @Reminiscent. Thanks for your PR.

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[Reminiscent]

Not sure whether this is required or not. PTAL @wjhuang2016

[ti-chi-bot]

@Reminiscent: 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/build	c4de641	link	true	/test build
pull-build-next-gen	c4de641	link	true	/test pull-build-next-gen
idc-jenkins-ci-tidb/check_dev	c4de641	link	true	/test check-dev

Full PR test history. Your PR dashboard.

Details

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[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-tests-checked label, please finished the tests then check the finished items in description.

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Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
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[Reminiscent]

wait #65072 merged and add more benchmark test cases