Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/3438
I looked over the changes and didn't find anything critical. The only thing
that made me thinking was the boxed `Long` type for the timestamp(). I assume
you decided for this approach to signal timestamp unavailability using `null`.
The Java documentation does not recommend to rely on autoboxing for performance
critical code:
http://docs.oracle.com/javase/1.5.0/docs/guide/language/autoboxing.html
Tests, Scala API were done. I assume that we don't need to explicitly
mention support for the process function on non-keyed streams.
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