simonepri commented on pull request #12421:
URL: https://github.com/apache/beam/pull/12421#issuecomment-666763106
> In practice, having no elements at all is so uncommon, it's not reasonable
to include that in basic utility transforms, since they never apply, and no
data = no compute is a better condition to maintain.
I agree it is uncommon, but still it is probably good to have some sane
default for common operations.
For instance (when in doubt) it might be a good idea (or maybe not) to be
consistent with what happen in SQL.
In SQL the sum of an empty set is null (i.e. in our case an empty
PCollection), while the count of an empty set is 0.
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