Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1265#issuecomment-149141741
But the state behaves the same in triggers and operators. I think it would
be good to have a common interface there.
I didn't add the getState() methods with Class/TypeInformation since that
would basically require re-implementing the state stuff inside WindowOperator.
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