statistics: debug panic

[hawkingrei]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from hawkingrei, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

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Needs approval from an approver in each of these files:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.1490%. Comparing base (1352db6) to head (539fde5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56677         +/-   ##
=================================================
- Coverage   73.3549%   56.1490%   -17.2060%     
=================================================
  Files          1629       1778        +149     
  Lines        450098     637030     +186932     
=================================================
+ Hits         330169     357686      +27517     
- Misses        99694     254717     +155023     
- Partials      20235      24627       +4392     

Flag	Coverage Δ
integration	24.3086% <0.0000%> (?)
unit	72.4702% <100.0000%> (-0.0160%)	⬇️

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

Components	Coverage Δ
dumpling	52.8344% <ø> (-0.1134%)	⬇️
parser	∅ <ø> (∅)
br	52.4069% <ø> (+6.8341%)	⬆️

[hawkingrei]

/test all

[hawkingrei]

/test all

[hawkingrei]

/retest

[hawkingrei]

/test all

[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

_{📖 For more info, you can check the "Contribute Code" section in the development guide.}

---

Notice: To remove the do-not-merge/needs-tests-checked label, please finished the tests then check the finished items in description.

For example:

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

_{📖 For more info, you can check the "Contribute Code" section in the development guide.}

[ti-chi-bot]

@hawkingrei: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	539fde5	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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