infoschema: fix sub_part in information_schema.statistics table

[Defined2014]

What problem does this PR solve?

Issue Number: close #55812

Problem Summary: We didn't set sub_part column correctly in information_schema.statistics table, just fix it.
Also found a bug related with mysql-tester. pingcap/mysql-tester#131

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

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None

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.1997%. Comparing base (0583e84) to head (43760c6).
Report is 143 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #55814         +/-   ##
=================================================
- Coverage   72.7958%   56.1997%   -16.5961%     
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  Files          1588       1714        +126     
  Lines        443469     616161     +172692     
=================================================
+ Hits         322827     346281      +23454     
- Misses       100772     246325     +145553     
- Partials      19870      23555       +3685     

Flag	Coverage Δ
integration	37.1378% <100.0000%> (?)
unit	71.9576% <100.0000%> (+0.0510%)	⬆️

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Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.2831% <ø> (+6.8519%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-03 07:47:03.510623619 +0000 UTC m=+344148.028676714: ☑️ agreed by hawkingrei.
• 2024-09-03 09:04:58.142988512 +0000 UTC m=+348822.661041438: ☑️ agreed by lance6716.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #55904.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #56208.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #56209.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #56210.