Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21599
@cloud-fan ok, but then all arithmetic operations should be always
`nullable = true`. I am not sure whether this can introduce performance
regression (the additional checks are also going to worsen performance, but I
don't see any way to avoid it).
If there are no objections, I am going to update the PR according to your
suggestion. Thanks.
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