[jira] [Updated] (BEAM-10418) Support type hint annotations on CombineFn add_input() and extract_output()

["Beam JIRA Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-10418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Beam JIRA Bot updated BEAM-10418:
---------------------------------
    Labels: stale-P2 types  (was: types)

> Support type hint annotations on CombineFn add_input() and extract_output()
> ---------------------------------------------------------------------------
>
>                 Key: BEAM-10418
>                 URL: https://issues.apache.org/jira/browse/BEAM-10418
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-py-core
>            Reporter: Matt McDonald
>            Priority: P2
>              Labels: stale-P2, types
>
> Similar to the tweaks for supporting native type hints on the {{PTransform.expand()}} method (https://issues.apache.org/jira/browse/BEAM-10258), it would be beneficial if the {{CombineFn}} class also received similar treatment, offering a way to provide type hints through the native Python hinting interface.
> Adding hints to the CombineFn's {{add_input()}} and {{extract_output()}} methods should be sufficient for providing the equivalent behavior of annotating the class with beam typehint decorators, e.g.,
> {code:python}
> @beam.typehints.with_input_types(int)
> @beam.typehints.with_output_types(bool)
> class MyCombineFn(CombineFn):
>   ...
> {code}
> vs
> {code:python}
> class MyCombineFn(CombineFn):
>   def add_input(self, accumulator: float, element: int):
>     ...
>   def extract_output(self, accumulator: float) -> bool
>     ...
> {code}



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