Github user dianfu commented on the issue:
https://github.com/apache/flink/pull/4172
@kl0u Thanks for your suggestions. I think the optimizations in this PR
are straight forward. IMO, the changes which may have something to do with
other features ongoing are all in `AbstractKeyedCEPPatternOperator` and the
changes to that file are so not much and should not be a problem. Since the PR
is already available, it will not require much efforts to do these
optimizations. What's your thought?
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