stats: fix index_length in information_schema

[Defined2014]

What problem does this PR solve?

Issue Number: close #54173

Problem Summary:

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.2944%. Comparing base (8ee4897) to head (7a66795).
Report is 42 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54176         +/-   ##
=================================================
- Coverage   72.8670%   56.2944%   -16.5726%     
=================================================
  Files          1516       1639        +123     
  Lines        434796     612529     +177733     
=================================================
+ Hits         316823     344820      +27997     
- Misses        98428     244241     +145813     
- Partials      19545      23468       +3923     

Flag	Coverage Δ
integration	37.0888% <100.0000%> (?)
unit	71.7762% <100.0000%> (-0.0866%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.3318% <ø> (+6.1990%)	⬆️

[mjonss]

LGTM, with one minor suggestion.

[mjonss]

Maybe simplify this if ... else .. block to just a "Getting dataLength, indexLenght" + loop over partitions and add the data and index length for each partition?

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-24 10:18:12.328837144 +0000 UTC m=+628418.814325975: ☑️ agreed by mjonss.
• 2024-06-25 02:19:52.226526184 +0000 UTC m=+686118.712015013: ☑️ agreed by hawkingrei.