alamb opened a new issue, #8800:
URL: https://github.com/apache/arrow-rs/issues/8800

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   - Similarly to https://github.com/apache/arrow-rs/issues/7299 there may be 
times when it is useful to know the row group number for each row (to compute 
per-row group statistics, for example)
   
   
   
   **Describe the solution you'd like**
   Consider adding a `_row_group` column, similar to adding the file row number 
described in 
   - https://github.com/apache/arrow-rs/issues/7299
   
   **Describe alternatives you've considered**
   
   **Additional context**
   I vaguely remember someone asked me about this (maybe @adriangb )
   
   With the advent of https://github.com/apache/arrow-rs/issues/7299 from 
@vustef, I wanted to document the other usecases for virtual columns  
   


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