iemejia commented on pull request #14854:
URL: https://github.com/apache/beam/pull/14854#issuecomment-848793500
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.
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