Dandandan commented on issue #5646:
URL: 
https://github.com/apache/arrow-datafusion/issues/5646#issuecomment-1495416237

   The most expensive part is the line `let values = &cast(values, sum_type)?` 
in `sum_batch` which performs this casting.
   
   I guess we should move that evaluation (or other parts of `sum_batch` as 
well) up, so it will be done before the grouping, rather than after.


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