kennknowles commented on a change in pull request #12088:
URL: https://github.com/apache/beam/pull/12088#discussion_r445894269



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File path: sdks/python/apache_beam/transforms/util.py
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@@ -741,6 +741,7 @@ def WithKeys(pcoll, k):
 
 @experimental()
 @typehints.with_input_types(Tuple[K, V])
[email protected]_output_types(Tuple[K, List[V]])

Review comment:
       A very real situation is that it might already be partitioned however 
the runner wants, via analyzing the pipeline.




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