infoschema: update two tests to make them robust and a tiny fix

[tiancaiamao]

What problem does this PR solve?

Issue Number: close #55132, ref #50959

Problem Summary:

What changed and how does it work?

This changes are pick from #55229
I'd like to enable infoschema v2 by default in that PR, but it will wait v8.3 release before merge.

There are one bug and two unstable tests fix by that PR, it's better to make it into v8.3

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

If enable infoschema v2 by default, the bug would be exposed and covered.

• 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

[tiprow]

Hi @tiancaiamao. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.9873%. Comparing base (67d6e70) to head (087dc96).
Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55362        +/-   ##
================================================
+ Coverage   74.8088%   74.9873%   +0.1785%     
================================================
  Files          1572       1572                
  Lines        365128     440230     +75102     
================================================
+ Hits         273148     330117     +56969     
- Misses        72191      89525     +17334     
- Partials      19789      20588       +799     

Flag	Coverage Δ
integration	48.5146% <100.0000%> (?)
unit	72.1160% <100.0000%> (-1.6109%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (-2.2327%)	⬇️
parser	∅ <ø> (∅)
br	59.1885% <ø> (+11.5018%)	⬆️

[tiancaiamao]

/retest

[tiprow]

@tiancaiamao: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[GMHDBJD]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [GMHDBJD,lance6716]
• pkg/domain/OWNERS [GMHDBJD,lance6716]
• pkg/infoschema/OWNERS [GMHDBJD]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-12 07:46:05.542107467 +0000 UTC m=+167650.245577120: ☑️ agreed by lance6716.
• 2024-08-12 11:05:12.599466256 +0000 UTC m=+179597.302935916: ☑️ agreed by GMHDBJD.