[jira] [Created] (BEAM-12413) Type inference works incorrectly with tuple slices

["Dmytro Kozhevin (Jira)" <ji...@apache.org>]

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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