planner: add test about memo derive stats.

[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

[tiprow]

Hi @AilinKid. Thanks for your PR.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-12 09:06:37.669684056 +0000 UTC m=+515787.758486599: ☑️ agreed by qw4990.
• 2024-12-12 09:20:29.526327012 +0000 UTC m=+516619.615129554: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.7462%. Comparing base (1d53c85) to head (51c316d).
Report is 56 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58207        +/-   ##
================================================
+ Coverage   73.2271%   73.7462%   +0.5190%     
================================================
  Files          1676       1676                
  Lines        462084     462482       +398     
================================================
+ Hits         338371     341063      +2692     
+ Misses       102947     100691      -2256     
+ Partials      20766      20728        -38     

Flag	Coverage Δ
integration	43.2533% <ø> (?)
unit	72.4460% <ø> (+0.0806%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	45.9998% <ø> (+0.0360%)	⬆️