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

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

    [ https://issues.apache.org/jira/browse/BEAM-10833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17191080#comment-17191080 ] 

Jayendra commented on BEAM-10833:
---------------------------------

With some pycharm debugging I was able to detect that error is due to registration of wrong coder, so for the first element of tuple in the example which is char/str the registered coder is `VarIntCoder` which is wrong. After some more debugging I found that serialised `BundleDescriptor` has that info, but I am struggling to find where this information is being filled.

> 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
>            Assignee: Jayendra
>            Priority: P1
>
> {code:python}
> 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
> {code}



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