util: remove localpool which is unused now

[lance6716]

What problem does this PR solve?

Issue Number: ref #54197

Problem Summary:

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 @lance6716. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.2764%. Comparing base (9f6b380) to head (228021a).
Report is 39 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54228         +/-   ##
=================================================
- Coverage   74.8659%   57.2764%   -17.5895%     
=================================================
  Files          1522       1645        +123     
  Lines        361462     620218     +258756     
=================================================
+ Hits         270612     355239      +84627     
- Misses        71312     242016     +170704     
- Partials      19538      22963       +3425     

Flag	Coverage Δ
integration	38.6923% <ø> (?)
unit	73.2316% <ø> (-0.5408%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (-2.2339%)	⬇️
parser	∅ <ø> (∅)
br	52.7657% <ø> (+4.7856%)	⬆️

[lance6716]

/cc @hawkingrei @lcwangchao

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-28 02:35:49.7851202 +0000 UTC m=+946276.270609025: ☑️ agreed by D3Hunter.
• 2024-06-28 14:55:31.011243571 +0000 UTC m=+990657.496732403: ☑️ agreed by hawkingrei.