Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/234#issuecomment-64443601
@aljoscha Can you have a look at this?
The code fails when using the "default co group" in the Scala API (see
ignored test
https://github.com/apache/incubator-flink/pull/234/files#diff-4f9cfc3e3b499122f9e12653b5761e1aR124)
The reason is the current way of wrapping the Operators in a Scala Data
Set, together with the shared binary key operations (that prevent operator
specific functions, like group sorting). I am not sure what would be the best
way to solve this without quite some changes to the Scala APIs design.
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