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).

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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[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

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[hawkingrei]

/hold