planner: move logical union scan into logicalop pkg.

[AilinKid]

What problem does this PR solve?

Issue Number: ref #51664, ref #52714

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

All modified and coverable lines are covered by tests ✅

Project coverage is 74.7911%. Comparing base (3dfa15c) to head (0f4e857).
Report is 3 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55159        +/-   ##
================================================
+ Coverage   72.8486%   74.7911%   +1.9425%     
================================================
  Files          1570       1574         +4     
  Lines        439518     440957      +1439     
================================================
+ Hits         320183     329797      +9614     
+ Misses        99610      90554      -9056     
- Partials      19725      20606       +881     

Flag	Coverage Δ
integration	27.0837% <46.6666%> (?)
unit	71.9664% <100.0000%> (+0.0786%)	⬆️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	61.3620% <ø> (+15.4999%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/planner/OWNERS [hawkingrei,qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-02 08:37:26.360140226 +0000 UTC m=+78643.578901833: ☑️ agreed by qw4990.
• 2024-08-02 09:10:33.03172815 +0000 UTC m=+80630.250489758: ☑️ agreed by hawkingrei.