ddl: fix cancelling stuck issue during adding index

[tangenta]

What problem does this PR solve?

Issue Number: close #61087

Problem Summary:

The getChunk() stuck issue has been solved by #57468, which changed the chunk pool implementation from channel to a sync.Pool.

What changed and how does it work?

This PR only adds the test to make sure that there will be no regression in the future.

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 @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.0322%. Comparing base (92925e9) to head (e7f678e).
Report is 42 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61544        +/-   ##
================================================
+ Coverage   73.0942%   75.0322%   +1.9380%     
================================================
  Files          1729       1752        +23     
  Lines        480715     492003     +11288     
================================================
+ Hits         351375     369161     +17786     
+ Misses       107793      99790      -8003     
- Partials      21547      23052      +1505     

Flag	Coverage Δ
integration	49.0678% <0.0000%> (?)
unit	72.4104% <100.0000%> (+0.0492%)	⬆️

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

Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	62.7803% <ø> (+15.8136%)	⬆️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-06-06 06:32:32.211748861 +0000 UTC m=+596238.414094126: ☑️ agreed by fzzf678.
• 2025-06-06 06:58:28.397179128 +0000 UTC m=+597794.599524393: ☑️ agreed by CbcWestwolf.

[tangenta]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, fzzf678, tangenta

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[hawkingrei]

/retest

[hawkingrei]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #61723.
But this PR has conflicts, please resolve them!

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #61724.
But this PR has conflicts, please resolve them!