planner: leverage stats collection rule to get operator num

[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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[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 73.6196%. Comparing base (de2b7ac) to head (72e647a).
Report is 15 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58635        +/-   ##
================================================
+ Coverage   73.0887%   73.6196%   +0.5309%     
================================================
  Files          1676       1676                
  Lines        463516     464350       +834     
================================================
+ Hits         338778     341853      +3075     
+ Misses       103897     101697      -2200     
+ Partials      20841      20800        -41     

Flag	Coverage Δ
integration	42.8822% <100.0000%> (?)
unit	72.4058% <76.9230%> (+0.1231%)	⬆️

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	45.8327% <ø> (+0.0572%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,qw4990]
• pkg/planner/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-31 10:00:05.101714573 +0000 UTC m=+430940.457719113: ☑️ agreed by hawkingrei.
• 2025-01-02 06:20:52.798166302 +0000 UTC m=+590588.154170840: ☑️ agreed by qw4990.