Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/5941
As discussed separately, I think that this could be simplified quiet a bit
and that we do not require connected streams. The operator state does not have
to depend on the input events. For example, it could just be something that is
correlated with the subtask index, and you can reason about repartitioning by
that.---
