planner: choose to generate optimal plans without plan cache rather than generating suboptimal plans and caching it when generating MVIndex plans

[qw4990]

What problem does this PR solve?

Issue Number: ref #45798

Problem Summary: planner: choose to generate optimal plans without plan cache rather than generating suboptimal plans with plan cache when generating MVIndex plans

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 @qw4990. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51546 (5b0579a) into master (f94a6ba) will increase coverage by 2.0062%.
Report is 7 commits behind head on master.
The diff coverage is 81.8181%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51546        +/-   ##
================================================
+ Coverage   70.7917%   72.7979%   +2.0062%     
================================================
  Files          1467       1467                
  Lines        436397     437324       +927     
================================================
+ Hits         308933     318363      +9430     
+ Misses       108129      98956      -9173     
- Partials      19335      20005       +670     

Flag	Coverage Δ
integration	49.1128% <45.4545%> (?)
unit	70.5017% <81.8181%> (-0.0963%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.4849% <ø> (+5.5903%)	⬆️

[windtalker]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-07 07:22:48.270118676 +0000 UTC m=+324595.292365064: ☑️ agreed by AilinKid.
• 2024-03-07 09:07:16.276439105 +0000 UTC m=+330863.298685493: ☑️ agreed by windtalker.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, hawkingrei, windtalker

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[hawkingrei]

/retest