structure: fix deadloop and debug

[wjhuang2016]

What problem does this PR solve?

Issue Number: close #64323

Problem Summary:
Deadloop and cause high CPU usage

What changed and how does it work?

fix deadloop and print log for debug

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-8.5-20251107-v8.5.3@dc2548a). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-8.5-20251107-v8.5.3     #64324   +/-   ##
================================================================
  Coverage                               ?   74.1654%           
================================================================
  Files                                  ?       1650           
  Lines                                  ?     452223           
  Branches                               ?          0           
================================================================
  Hits                                   ?     335393           
  Misses                                 ?      94672           
  Partials                               ?      22158           

Flag	Coverage Δ
integration	27.9233% <0.0000%> (?)
unit	72.7455% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9278% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.6076% <0.0000%> (?)

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[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-11-07 02:54:44.787265795 +0000 UTC m=+411534.230295673: ☑️ agreed by time-and-fate.
• 2025-11-07 03:27:15.907245192 +0000 UTC m=+413485.350275071: ☑️ agreed by Benjamin2037.