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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/07/30 09:43:29 UTC
[GitHub] [beam] simonepri opened a new pull request #12421: Fix go count on an empty pcollection
simonepri opened a new pull request #12421:
URL: https://github.com/apache/beam/pull/12421
The documentation says
> CountElms counts the number of elements in a collection.
> It expects a PCollection<T> as input and returns a PCollection<int> of **one element** containing the count.
If the input is an empty PCollection<T> the output is empty as well.
This is probably an intended behaviour, and in case feel free to close this.
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[GitHub] [beam] lostluck merged pull request #12421: Fix go count on an empty pcollection
Posted by GitBox <gi...@apache.org>.
lostluck merged pull request #12421:
URL: https://github.com/apache/beam/pull/12421
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[GitHub] [beam] simonepri commented on pull request #12421: Fix go count on an empty pcollection
Posted by GitBox <gi...@apache.org>.
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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[GitHub] [beam] simonepri edited a comment on pull request #12421: Fix go count on an empty pcollection
Posted by GitBox <gi...@apache.org>.
simonepri edited a comment 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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[GitHub] [beam] simonepri commented on pull request #12421: Fix go count on an empty pcollection
Posted by GitBox <gi...@apache.org>.
simonepri commented on pull request #12421:
URL: https://github.com/apache/beam/pull/12421#issuecomment-666285522
R: @youngoli, @lostluck
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