ibzib commented on pull request #15712:
URL: https://github.com/apache/beam/pull/15712#issuecomment-946261420


   > All of these seem to assume the operation in question has a single 
input/output. Should these instead be parameterized by the input/output name?
   
   @robertwb Yes. I tried parameterizing by TupleTag id, since AFAICT 
PCollection names are assigned later and therefore not known to the DoFn. Let 
me know whether you think that's the right approach.


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