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https://issues.apache.org/jira/browse/BEAM-8502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Udi Meiri updated BEAM-8502:
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Status: Open (was: Triage Needed)
> Python typehints: support type hint decorators with ptransform_fn
> -----------------------------------------------------------------
>
> Key: BEAM-8502
> URL: https://issues.apache.org/jira/browse/BEAM-8502
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Udi Meiri
> Assignee: Udi Meiri
> Priority: Major
>
> In this example, the input type hint does not currently get propagated
> (TypeCheckError is not raise):
> {code}
> def test_typed_ptransform_fn(self):
> # Test that type hints are propagated to the created PTransform.
> @beam.ptransform_fn
> @typehints.with_input_types(int)
> def MyMap(pcoll):
> return pcoll | beam.ParDo(lambda x: [x])
> self.assertListEqual([1, 2, 3], [1, 2, 3] | MyMap())
> with self.assertRaises(typehints.TypeCheckError):
> _ = ['a'] | MyMap()
> {code}
> The fix is relatively simple but might break existing pipelines that have old
> (unchecked) hints.
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