cozos commented on issue #24035:
URL: https://github.com/apache/beam/issues/24035#issuecomment-1330805569

   Thank you for the clarification. If you care to know the context, I was 
digging into the Python `Write` ptransform, which reuses side inputs heavily:
   
   
https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/iobase.py#L1151-L1174
   
   If I understand correctly, the previous behaviour which does recomputation 
of side inputs would be really bad for performance, as it would repeat the 
writing of files many times.


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