alamb commented on issue #1418:
URL: 
https://github.com/apache/arrow-datafusion/issues/1418#issuecomment-989971422


   @liukun4515  -- I think the rationale for using `float64` for the result of 
`sum(float32)` and `avg(float32)` is done to minimize error due to floating 
point rounding
   
   I think using `float64` for the result type makes sense


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