ttl: fix some memory leak in TTL (#56935)

[lcwangchao]

What problem does this PR solve?

Issue Number: close #56934

What changed and how does it work?

This is cherry-pick of #56935

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 @lcwangchao. Thanks for your PR.

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[bb7133]

LGTM

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, YangKeao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-30 02:49:27.755534587 +0000 UTC m=+404480.594690135: ☑️ agreed by bb7133.
• 2024-10-30 02:58:49.058475453 +0000 UTC m=+405041.897630993: ☑️ agreed by YangKeao.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.1-20241030-v8.1.1@a7df4f9). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-8.1-20241030-v8.1.1     #56977   +/-   ##
================================================================
  Coverage                               ?   71.1744%           
================================================================
  Files                                  ?       1466           
  Lines                                  ?     422882           
  Branches                               ?          0           
================================================================
  Hits                                   ?     300984           
  Misses                                 ?     101402           
  Partials                               ?      20496           

Flag	Coverage Δ
unit	71.1744% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3451% <0.0000%> (?)

[lcwangchao]

/retest

[tiprow]

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

In response to this:

/retest

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