[jira] [Created] (BEAM-10833) Error inferring type of tuple output

["Robert Bradshaw (Jira)" <ji...@apache.org>]

Robert Bradshaw created BEAM-10833:
--------------------------------------

             Summary: Error inferring type of tuple output
                 Key: BEAM-10833
                 URL: https://issues.apache.org/jira/browse/BEAM-10833
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Robert Bradshaw


```
with beam.Pipeline() as p:

  class Foo(beam.DoFn):
    def process(self, element):
      k, v = element
      yield (k, {k:v})

  a = [('a',1), ('a',1), ('b',1)]

  input = p | beam.Create(a)
  print(input.element_type)  # ok

  pcoll = input | beam.ParDo(Foo())
  print(pcoll.element_type) # claims Tuple[int, Dict[Any, Any]]

# BOOM on run due to coder errors
```



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