fix(rust): fix get categories on multiple row groups

[c-peters]

fix #16916

[ritchie46]

Can we add a test?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.00%. Comparing base (5bb28b4) to head (82a5ec6).
Report is 52 commits behind head on main.

❗ Current head 82a5ec6 differs from pull request most recent head 91c1ea4

Please upload reports for the commit 91c1ea4 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17041      +/-   ##
==========================================
- Coverage   81.09%   81.00%   -0.10%     
==========================================
  Files        1435     1448      +13     
  Lines      189567   190551     +984     
  Branches     2712     2723      +11     
==========================================
+ Hits       153736   154353     +617     
- Misses      35331    35695     +364     
- Partials      500      503       +3     

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