Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/3477
Hi @dawidwys , I will start reviewing your PR now.
I would say that for now it makes sense to have it with exceptions and not
change the `Pattern` hierarchy. The reason is:
1) not sure what the above split will imply to backwards compatibility
2) there are some additional features that will be nice to have, and they
all affect also how patterns are defined. A refactoring of the `Pattern`
hierarchy would make more sense as soon as we have everything in place, and we
can factor in this knowledge when designing.
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