*: fix wrong result when to concurrency merge global stats (#48852)

[ti-chi-bot]

This is an automated cherry-pick of #48852

What problem does this PR solve?

Issue Number: close #48713

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.1@5fbffee). Click here to learn what that means.
The diff coverage is 63.8888%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #51147   +/-   ##
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  Coverage               ?   73.4085%           
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  Lines                  ?     378768           
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  Hits                   ?     278048           
  Misses                 ?      82943           
  Partials               ?      17777           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [AilinKid,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-19 10:02:36.442916947 +0000 UTC m=+265045.190540069: ☑️ agreed by hawkingrei.
• 2024-02-19 10:17:05.10106063 +0000 UTC m=+265913.848683742: ☑️ agreed by AilinKid.