stats: panic in the MergePartitionHist2GlobalHist

[hawkingrei]

What problem does this PR solve?

Issue Number: close #55920

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

before the bugfix, it is a flaky test in the check2, but now i cannot see it again.

• 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

Attention: Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.1203%. Comparing base (2e51209) to head (56be487).
Report is 712 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56676         +/-   ##
=================================================
- Coverage   73.3302%   56.1203%   -17.2100%     
=================================================
  Files          1630       1779        +149     
  Lines        450210     637010     +186800     
=================================================
+ Hits         330140     357492      +27352     
- Misses        99803     254878     +155075     
- Partials      20267      24640       +4373     

Flag	Coverage Δ
integration	24.2601% <26.6666%> (?)
unit	72.4565% <66.6666%> (-0.0005%)	⬇️

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	52.3907% <ø> (+6.8048%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-16 15:17:38.628794109 +0000 UTC m=+457055.777703933: ☑️ agreed by winoros.
• 2024-10-17 03:34:34.944360248 +0000 UTC m=+501272.093270072: ☑️ agreed by AilinKid.

[hawkingrei]

/hold

[hawkingrei]

/test all

[hawkingrei]

/unhandle

[hawkingrei]

/unhold

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,winoros]
• pkg/statistics/OWNERS [AilinKid,winoros]

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[hawkingrei]

/hold

[ti-chi-bot]

PR needs rebase.

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[ti-chi-bot]

@hawkingrei: The following tests 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	56be487	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	56be487	link	true	/test check-dev2
pull-integration-e2e-test	56be487	link	true	/test pull-integration-e2e-test

Full PR test history. Your PR dashboard.

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