Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1138#issuecomment-142754122
Agreed with Fabian. For now, let's require join functions.
Future work would be to use Tuples with Options in Scala. In Java, we
should probably add an option type as well (and teach the TypeExtractor to use
them). Java core adds an Option type only in Java 8, unfortunately.
We could add one for Java 7 and deprecate it later.
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