statistics: move some functions into global stats

[hawkingrei]

What problem does this PR solve?

Issue Number: ref #46905

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 #47669 (5dc9b43) into master (34bc3a1) will increase coverage by 0.8630%.
Report is 5 commits behind head on master.
The diff coverage is 36.8421%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47669        +/-   ##
================================================
+ Coverage   71.9564%   72.8194%   +0.8629%     
================================================
  Files          1396       1419        +23     
  Lines        404738     411154      +6416     
================================================
+ Hits         291235     299400      +8165     
+ Misses        93906      92911       -995     
+ Partials      19597      18843       -754     

Flag	Coverage Δ
integration	41.3254% <6.3157%> (?)
unit	71.9200% <36.8421%> (-0.0364%)	⬇️

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	48.6761% <ø> (-4.2775%)	⬇️

[Rustin170506]

Thanks!

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, qw4990

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hi-rustin,qw4990]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-16 09:20:45.414849338 +0000 UTC m=+1648843.001959482: ☑️ agreed by qw4990.
• 2023-10-16 09:48:06.754571922 +0000 UTC m=+1650484.341682052: ☑️ agreed by hi-rustin.