Github user aljoscha commented on the pull request:
https://github.com/apache/incubator-flink/pull/275#issuecomment-67827360
Yes, @rmetzger added some magic when he unified Pojo and Tuple keys.
TypeComparator has a method extractKeys() that does exactly that. It extracts
the key fields of a tuple or object and stores them in an array. I think all
the infrastructure is there. You can just use Keys.java and create
TypeComparators, those you can use for everything else. Maybe @rmetzger can
have a look and make some suggestions for how this could best be implemented in
the Streaming API.
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