infoschemaV2: add ut for v2 and some refine

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #50959

Problem Summary:

What changed and how does it work?

1. move interface of infoschema to interface.go
2. extract some common util for ut.
3. add ut for infoschemaV2.

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

[tiprow]

Hi @ywqzzy. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51507 (cec796b) into master (748dbc9) will increase coverage by 1.5261%.
Report is 1 commits behind head on master.
The diff coverage is 98.1308%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51507        +/-   ##
================================================
+ Coverage   70.7570%   72.2831%   +1.5261%     
================================================
  Files          1464       1464                
  Lines        435794     436132       +338     
================================================
+ Hits         308355     315250      +6895     
+ Misses       108109     101307      -6802     
- Partials      19330      19575       +245     

Flag	Coverage Δ
integration	47.4077% <100.0000%> (?)
unit	70.5197% <98.1308%> (-0.0352%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	47.8295% <ø> (+1.9333%)	⬆️

[ywqzzy]

/retest

[tiprow]

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

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/retest

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tiancaiamao, wjhuang2016

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• pkg/infoschema/OWNERS [wjhuang2016]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-06 07:59:29.410087375 +0000 UTC m=+240396.432333763: ☑️ agreed by wjhuang2016.
• 2024-03-06 08:22:56.935897428 +0000 UTC m=+241803.958143811: ☑️ agreed by tiancaiamao.