boyuanzz commented on pull request #14854:
URL: https://github.com/apache/beam/pull/14854#issuecomment-849828926
> I cherry-picked @boyuanzz commit from the other PR notice however that I
could not get the Type to be preserved after the two DoFns are applied.
>
> In `OutputSingleSource` I was able to export correctly the type by
overriding
>
> ```java
> @Override
> public TypeDescriptor<SourceT> getOutputTypeDescriptor() {
> return (TypeDescriptor<SourceT>)
> new TypeDescriptor<Source<T>>(getClass()) {}.where(
> new TypeParameter<T>() {},
source.getOutputCoder().getEncodedTypeDescriptor());
> }
> ```
>
> but in the second DoFn `BoundedSourceAsSDFWrapperFn`
>
> I did not find a way to recover the real type of T when overwriting
`getOutputTypeDescriptor`. Any suggestion for this? Otherwise I suppose the
solution on Read is good enough.
I would say, let's unblock you first : ) Can you file a JIRA issue on this?
I think we should find a ultimate solution there.
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