planner: add memo test and implement some logical operator's HashEquals.

[AilinKid]

What problem does this PR solve?

Issue Number: ref #51664

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

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[tiprow]

Hi @AilinKid. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 166 lines in your changes missing coverage. Please review.

Project coverage is 75.3298%. Comparing base (73f1cfe) to head (f32ac29).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #56250        +/-   ##
================================================
+ Coverage   73.3870%   75.3298%   +1.9428%     
================================================
  Files          1620       1620                
  Lines        447041     447237       +196     
================================================
+ Hits         328070     336903      +8833     
+ Misses        98871      89827      -9044     
- Partials      20100      20507       +407     

Flag	Coverage Δ
integration	48.9091% <0.0000%> (?)

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Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	52.2712% <ø> (+6.7386%)	⬆️

[AilinKid]

@winoros @elsa0520
current logical operator only care about some key elements to do the hash64

for example: astHints are not considered here, the start point is what the minimum we need to determinate this ds is unique one.

[AilinKid]

not sure for other elements, agile for adjustment in future

[AilinKid]

/retest-required

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@AilinKid: 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/unit-test	f32ac29	link	true	/test unit-test
idc-jenkins-ci-tidb/build	f32ac29	link	true	/test build

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