planner: move more methods from StatsHandle to its sub-packages

[qw4990]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary: planner: move more methods from StatsHandle to its sub-packages

What is changed and how it works?

planner: move more methods from StatsHandle to its sub-packages

No logical change, just refactor.

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 #47696 (c219d39) into master (5ac13d9) will increase coverage by 1.3718%.
Report is 9 commits behind head on master.
The diff coverage is 71.0743%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47696        +/-   ##
================================================
+ Coverage   71.8864%   73.2583%   +1.3718%     
================================================
  Files          1398       1420        +22     
  Lines        405057     418115     +13058     
================================================
+ Hits         291181     306304     +15123     
+ Misses        94266      92708      -1558     
+ Partials      19610      19103       -507     

Flag	Coverage Δ
integration	41.9817% <34.7107%> (?)
unit	72.4296% <71.0743%> (+0.5432%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	49.2515% <100.0000%> (-3.6670%)	⬇️

[hawkingrei]

/retest

[BornChanger]

br part change lgtm.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-17 04:48:37.95940755 +0000 UTC m=+1718915.546517687: ☑️ agreed by hawkingrei.
• 2023-10-17 05:54:00.267675843 +0000 UTC m=+1722837.854785973: ☑️ agreed by BornChanger.

[qw4990]

/test check-dev2

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[hawkingrei]

/retest

[qw4990]

/test check-dev2

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[qw4990]

/test check-dev2

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[qw4990]

/test check-dev2

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[qw4990]

/test mysql-test

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[hawkingrei]

/retest

[qw4990]

/test unit-test

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/ok-to-test

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/test check-dev2

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[qw4990]

/test check-dev2

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[hawkingrei]

/retest

[hawkingrei]

/cherrypick release-7.5

[ti-chi-bot]

@hawkingrei: new pull request created to branch release-7.5: #47727.

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/cherrypick release-7.5

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