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https://issues.apache.org/jira/browse/BEAM-8502?focusedWorklogId=335065&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-335065
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ASF GitHub Bot logged work on BEAM-8502:
----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Oct/19 17:51
Start Date: 28/Oct/19 17:51
Worklog Time Spent: 10m
Work Description: udim commented on pull request #9907: [BEAM-8502] Pass
type hints in ptransform_fn
URL: https://github.com/apache/beam/pull/9907
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 335065)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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