hint: avoid duplicate hints in QBHintHandler (#53921)

[ti-chi-bot]

This is an automated cherry-pick of #53921

What problem does this PR solve?

Issue Number: close #53767

Problem Summary:

What changed and how does it work?

QBHintHandler may produce duplicate hints. When it reaches the match stage, the first one will be marked as a hint, but the second one will be ignored, ultimately resulting in incorrect warning messages.

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

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-6.5@956e83d). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #53934   +/-   ##
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  Coverage               ?   73.6584%           
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  Files                  ?       1096           
  Lines                  ?     352075           
  Branches               ?          0           
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  Hits                   ?     259333           
  Misses                 ?      76081           
  Partials               ?      16661           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-11 11:25:17.345971484 +0000 UTC m=+463871.399283408: ☑️ agreed by AilinKid.
• 2024-06-11 11:29:15.235584483 +0000 UTC m=+464109.288896400: ☑️ agreed by hawkingrei.