test: fix analyze tests for next-gen

[tangenta]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

Unistore's analyze index processor cannot handle encoded index keys.

What changed and how does it work?

• Strip the prefixed keyspace before decoding index key.
• Fix TestAnalyzeColumnsWithVirtualColumnIndex, TestAnalyzeMVIndex and TestNormalAnalyzeOnCommonHandle.

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]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-09-22 13:16:07.421089189 +0000 UTC m=+276177.491582863: ☑️ agreed by winoros.
• 2025-09-22 13:30:20.354521513 +0000 UTC m=+277030.425015191: ☑️ agreed by hawkingrei.

[hawkingrei]

/retest

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.1815%. Comparing base (724cd2f) to head (b179eeb).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #63668        +/-   ##
================================================
+ Coverage   72.7910%   73.1815%   +0.3905%     
================================================
  Files          1842       1842                
  Lines        497997     498130       +133     
================================================
+ Hits         362497     364539      +2042     
+ Misses       113528     111634      -1894     
+ Partials      21972      21957        -15     

Flag	Coverage Δ
integration	42.0064% <16.6666%> (?)
unit	72.2971% <16.6666%> (-0.0289%)	⬇️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3816% <ø> (-0.0279%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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