Dmytro Kozhevin created BEAM-12413:
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Summary: Type inference works incorrectly with tuple slices
Key: BEAM-12413
URL: https://issues.apache.org/jira/browse/BEAM-12413
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Dmytro Kozhevin
Returning a slice of the tuple doesn't alter the type inference output. For
example:
{{@beam.typehints.with_output_types(Tuple[int, str])}}
{{class Foo(beam.DoFn):}}
{{ def process(self, a):}}
{{ yield a, str(a)}}
{{pipeline = beam.Pipeline(runner=InteractiveRunner())}}
{{pcoll = pipeline | beam.Create([1]) | beam.ParDo(Foo()) | beam.Map(lambda x:
x[1:])}}
{{print(pcoll.element_typ}}e)
This prints Tuple[int, str], while the real type is str. At worst, this should
return Any.
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