[GitHub] [beam] cozos commented on issue #18121: Allow a DoFn to opt in to mutating it's input

["cozos (via GitHub)" <gi...@apache.org>]

cozos commented on issue #18121:
URL: https://github.com/apache/beam/issues/18121#issuecomment-1524832762

   @kennknowles @francesperry 
   I'm trying to understand this better. So a DoFn does something like this in Python:
   
   ```
   def process(self, element: Dict[str, Any]) -> Iterator[Dict[str, Any]]:
       element["new_key"] = "new_value"
       yield element
   ```
   
   Bad things will happen? Under what conditions? Is this documented anywhere in Beam? I can't find anything here: https://beam.apache.org/documentation/programming-guide/#pardo


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