planner: a better way to round scale factor when collecting TopN stats

[qw4990]

What problem does this PR solve?

Issue Number: close #49801

Problem Summary: planner: a better way to round scale factor when collecting TopN stats

What changed and how does it work?

planner: a better way to round scale factor when collecting TopN stats

See #49801 for more details.

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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[wuhuizuo]

/retest

[tiprow]

@wuhuizuo: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/retest

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[codecov]

Codecov Report

Merging #49808 (2541343) into master (5f6ef18) will increase coverage by 0.4435%.
Report is 3 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #49808        +/-   ##
================================================
+ Coverage   70.9221%   71.3656%   +0.4435%     
================================================
  Files          1368       1429        +61     
  Lines        396367     415749     +19382     
================================================
+ Hits         281112     296702     +15590     
- Misses        95564     100247      +4683     
+ Partials      19691      18800       -891     

Flag	Coverage Δ
integration	43.9173% <100.0000%> (?)
unit	70.9221% <ø> (ø)

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

Components	Coverage Δ
dumpling	53.9663% <ø> (ø)
parser	∅ <ø> (∅)
br	47.2311% <ø> (-5.6722%)	⬇️

[qw4990]

/retest-required

[tiprow]

@qw4990: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest-required

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[hi-rustin]

Looks good to me. Thanks! 👍

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, hi-rustin

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-27 01:51:04.404707725 +0000 UTC m=+1616955.441934652: ☑️ agreed by hi-rustin.
• 2023-12-27 02:21:24.752713808 +0000 UTC m=+1618775.789940730: ☑️ agreed by hawkingrei.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #49819.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #49820.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #49821.