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Posted to github@arrow.apache.org by "westonpace (via GitHub)" <gi...@apache.org> on 2023/04/19 16:03:59 UTC

[GitHub] [arrow] westonpace commented on issue #35166: pa.compute.sum result for decimal128 doesn't fit into precision/scale

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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