planner: label plans as over-optimized for plan cache after refining cmp-function arguments

[qw4990]

What problem does this PR solve?

Issue Number: close #40679, close #41032

Problem Summary: planner: label plans as over-optimized for plan cache after refining cmp-function arguments

What is changed and how it works?

planner: label plans as over-optimized for plan cache after refining cmp-function arguments

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

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[ti-chi-bot]

@qw4990: 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
idc-jenkins-ci-tidb/unit-test	e310848	link	true	/test unit-test

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