zanmato1984 commented on PR #44184:
URL: https://github.com/apache/arrow/pull/44184#issuecomment-2843508113
> @khwilson I'm still not sure this is actually desirable (@zanmato1984 what
do you think?).
Most DBMSes do precision promotion for `sum` aggregation, and most
promotions are arbitrary. So I think the idea of this issue/PR makes very much
sense. I will look further into the implementation later.
> What I think is definitely desirable is to check for overflow when doing
sum/mean/product of decimals, regardless of which data type is selected for
output.
Agreed, checked versions are necessary.
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