Dandandan edited a comment on issue #272:
URL: 
https://github.com/apache/arrow-datafusion/issues/272#issuecomment-833826346


   @alamb yes, that's a great one - isn't that only feasible with 
`SUM`/`MAX`/`MIN`? I think primary use case would be `COUNT` or `AVG`
   
   Edit: yeah or similulating count through sum, as I am seeing in your example.


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