Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/2508
  
    Another possibility would be to simply add a `NoOp` operator behind a union 
with multiple outputs with different partitioning schemes. That prevents the 
unions from being merged. 
    
    Would that not be better, in terms of not duplicating records (as it 
happens when having multiple instances of the one union operator)?


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