Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2305
I think, specify parallelism between `window(...)` and `apply(...)` is not
nice. We not just need `setParallelism` function but also `name`, `uid`,
`slotSharingGroup` and many other functions in `SingleOutputStreamOperator`. If
we copy these to `WithWindow`, it will be very duplicate.
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