friendlymatthew opened a new issue, #9181:
URL: https://github.com/apache/arrow-rs/issues/9181

   - Related https://github.com/apache/arrow-rs/pull/9117
   
   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   
   > From @alamb 
   > 
   > The other thing would be to pre-calculate the arrays (where the row group 
values don't change) and return the same ArrayRef until the RowGroup actually 
changes


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