planner: use the session pool to execute SQLs in statshandler

[qw4990]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary: planner: use the session pool to execute SQLs in statshandler

What is changed and how it works?

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 #47065 (a6bca96) into master (4cc6c65) will decrease coverage by 0.1962%.
Report is 5 commits behind head on master.
The diff coverage is 51.2345%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47065        +/-   ##
================================================
- Coverage   73.0345%   72.8383%   -0.1962%     
================================================
  Files          1336       1357        +21     
  Lines        398257     405333      +7076     
================================================
+ Hits         290865     295238      +4373     
- Misses        88616      91472      +2856     
+ Partials      18776      18623       -153     

Flag	Coverage Δ
integration	30.6918% <17.2839%> (?)
unit	73.1837% <51.2345%> (+0.1492%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.9728% <ø> (+0.0107%)	⬆️
br	48.7369% <ø> (-4.2900%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [AilinKid,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-19 01:47:39.226548737 +0000 UTC m=+568425.194136783: ☑️ agreed by hawkingrei.
• 2023-09-19 02:13:44.03917717 +0000 UTC m=+569990.006765221: ☑️ agreed by AilinKid.

[qw4990]

/test check-dev

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[qw4990]

/test unit-test

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[qw4990]

/test check-dev

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

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/test check-dev

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