aaltay commented on a change in pull request #12088:
URL: https://github.com/apache/beam/pull/12088#discussion_r447379446
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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])
+@typehints.with_output_types(Tuple[K, List[V]])
Review comment:
I am thinking something like this:
https://github.com/apache/beam/pull/12129 -- Have not really tested this yet
beyond a unit test. I ran the the print test Udi wrote above and the output is
batched by key.
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