Github user StephanEwen commented on the issue:
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)?
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket