executor: fix query panic on INFORMATION_SCHEMA.CLUSTER_SLOW_QUERY with some slow query files

[tiancaiamao]

What problem does this PR solve?

Issue Number: close #54324

Problem Summary:

What changed and how does it work?

The old code does not handle all the cases well.
if i >= len(lines)-1 should be a typo, it should be something like if i >= len(chars)-1
And the simplified logic is just the same as this PR.

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 @tiancaiamao. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.3452%. Comparing base (80c2218) to head (be1d3ec).
Report is 925 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54325         +/-   ##
=================================================
- Coverage   72.7965%   56.3452%   -16.4513%     
=================================================
  Files          1526       1652        +126     
  Lines        435900     610279     +174379     
=================================================
+ Hits         317320     343863      +26543     
- Misses        98931     243183     +144252     
- Partials      19649      23233       +3584     

Flag	Coverage Δ
integration	37.5014% <0.0000%> (?)
unit	72.1153% <100.0000%> (+0.3229%)	⬆️

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Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.7254% <ø> (+6.6106%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, Defined2014

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-28 17:26:19.938547655 +0000 UTC m=+999706.424036487: ☑️ agreed by crazycs520.
• 2024-07-01 06:42:08.985063218 +0000 UTC m=+1220255.470552049: ☑️ agreed by Defined2014.

[Defined2014]

/run-check-issue-triage-complete

[tiancaiamao]

/test unit-test

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/test unit-test

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[tiancaiamao]

/retest-required

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/retest-required

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #54710.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #54711.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #54935.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #56899.