westonpace commented on issue #35166:
URL: https://github.com/apache/arrow/issues/35166#issuecomment-1514990894

   Yikes.  That's definitely a bug.  I think the return type of sum should 
probably maximize the `P` parameter.
   
   E.g. `SUM(Decimal128<X,Y>) -> Decimal<38,Y>` and `SUM(Decimal256<X,Y>) -> 
Decimal<76,Y>`.  This matches the rules for Substrait as well as matches what 
SQL server does.


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