alamb commented on issue #3214:
URL: 
https://github.com/apache/arrow-datafusion/issues/3214#issuecomment-1233067355

   > Remove projection "hack" and delegate to file readers
   
   Yes, this is what I was talking about. 
https://docs.rs/datafusion/latest/datafusion/physical_optimizer/aggregate_statistics/struct.AggregateStatistics.html
 is very cool 👍 (thanks @rdettai !)


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