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https://issues.apache.org/jira/browse/BEAM-4506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546963#comment-17546963
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Kenneth Knowles commented on BEAM-4506:
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This issue has been migrated to https://github.com/apache/beam/issues/18774
> PTransform input_types hint with potential empty input
> ------------------------------------------------------
>
> Key: BEAM-4506
> URL: https://issues.apache.org/jira/browse/BEAM-4506
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Ahmet Altay
> Priority: P3
>
> User reported issue:
> ... PTransform class that takes a pcollection of Dict[str, numpy.ndarray] as
> input, and I added the annotation of
> @beam.typehints.with_input_types(beam.typehints.Dict[str, numpy.ndarray]).
> However, this causes error to empty dict input, and the error message is
> """Input type hint violation at _TopKStatsGeneratorImpl: expected Dict[str,
> ndarray], got Dict[Union[], Union[]] """
> From the user report it seems like our type hints could be more flexible in
> what they accept for empty dictionaries.
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