[GitHub] [beam] kennknowles opened a new issue, #18666: Empty flattens cannot be used as side inputs.

[GitBox <gi...@apache.org>]

kennknowles opened a new issue, #18666:
URL: https://github.com/apache/beam/issues/18666

   {{with beam.Pipeline() as p:
     main = p | "CM" \>\> beam.Create([])
     side1 = p | "C1" \>\> beam.Create([])
     side2 = p | "C2" \>\> beam.Create([])
     side = (side1, side2) | beam.Flatten()
     res = main | beam.Map(lambda x, side: x, beam.pvalue.AsList(side))
   }}
   results in 
   {{
     File "/Users/robertwb/Work/beam/incubator-beam/sdks/python/apache_beam/runners/direct/evaluation_context.py", line 84, in add_values
       assert not view.has_result
   }}
   
   Imported from Jira [BEAM-3393](https://issues.apache.org/jira/browse/BEAM-3393). Original Jira may contain additional context.
   Reported by: robertwb.


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