hjtran commented on code in PR #30744: URL: https://github.com/apache/beam/pull/30744#discussion_r1542204692
########## sdks/python/apache_beam/transforms/core.py: ########## @@ -1907,7 +1907,9 @@ def FlatMap(fn = identity, *args, **kwargs): # pylint: disable=invalid-name The callable must return an iterable for each element of the input :class:`~apache_beam.pvalue.PCollection`. The elements of these iterables will - be flattened into the output :class:`~apache_beam.pvalue.PCollection`. + be flattened into the output :class:`~apache_beam.pvalue.PCollection`. If + no callable is given, then all elements of the input PCollection must already + be iterables themselves and will be flattened into the output PCollection. Review Comment: Inserted a new example pretty early on the page since it's likely more relevant for most users than the later ones. Happy to adjust or reorder though -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
