statistics: refactor test package

[hawkingrei]

What problem does this PR solve?

Issue Number: ref #44940

Problem Summary:

What is changed and how it works?

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

Merging #47608 (27b4c0e) into master (318e82b) will increase coverage by 0.9039%.
Report is 3 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47608        +/-   ##
================================================
+ Coverage   72.0167%   72.9207%   +0.9039%     
================================================
  Files          1395       1419        +24     
  Lines        404171     410562      +6391     
================================================
+ Hits         291071     299385      +8314     
+ Misses        93509      92344      -1165     
+ Partials      19591      18833       -758     

Flag	Coverage Δ
integration	41.2662% <ø> (?)
unit	72.0288% <ø> (+0.0121%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	49.0200% <ø> (-4.3450%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-13 05:25:33.83596585 +0000 UTC m=+1375531.423075995: ☑️ agreed by time-and-fate.
• 2023-10-13 06:21:50.200492298 +0000 UTC m=+1378907.787602443: ☑️ agreed by hi-rustin.

[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/hold

[hawkingrei]

/unhold

[hawkingrei]

/retest

[hawkingrei]

/merge

[ti-chi-bot]

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[tiprow]

@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
tiprow_fast_test	27b4c0e	link	true	/test tiprow_fast_test

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