planner: refactor to make tableStatsDelta thread-safe

[qw4990]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary: planner: refactor to make tableStatsDelta thread-safe

What is changed and how it works?

No logical change, just refactor

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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 #46977 (577972b) into master (0069b40) will decrease coverage by 0.4168%.
Report is 7 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46977        +/-   ##
================================================
- Coverage   73.2364%   72.8197%   -0.4168%     
================================================
  Files          1332       1354        +22     
  Lines        397608     404819      +7211     
================================================
+ Hits         291194     294788      +3594     
- Misses        87769      91404      +3635     
+ Partials      18645      18627        -18     

Flag	Coverage Δ
integration	28.6628% <16.2790%> (?)
unit	73.3555% <100.0000%> (+0.1190%)	⬆️

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

Components	Coverage Δ
dumpling	54.4418% <ø> (+0.3973%)	⬆️
parser	84.9911% <ø> (+0.0108%)	⬆️
br	48.6672% <ø> (-4.2290%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-14 09:12:57.847924621 +0000 UTC m=+163143.815512671: ☑️ agreed by hawkingrei.
• 2023-09-14 12:43:55.255189365 +0000 UTC m=+175801.222777414: ☑️ agreed by winoros.

[qw4990]

/test unit-test

[tiprow]

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/test unit-test

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