planner: no_decorrelate triggered by cost factors

[terry1purcell]

What problem does this PR solve?

Issue Number: ref #51116

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

[ti-chi-bot]

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[tiprow]

Hi @terry1purcell. Thanks for your PR.

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[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.1339%. Comparing base (8d1a00e) to head (8bb314d).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #63273        +/-   ##
================================================
+ Coverage   72.7835%   73.1339%   +0.3504%     
================================================
  Files          1831       1832         +1     
  Lines        495392     497874      +2482     
================================================
+ Hits         360564     364115      +3551     
+ Misses       112905     111791      -1114     
- Partials      21923      21968        +45     

Flag	Coverage Δ
integration	42.1677% <86.9565%> (?)
unit	72.2464% <86.9565%> (-0.0078%)	⬇️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.2195% <ø> (-0.1340%)	⬇️

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