Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/85#issuecomment-50585614
In `DataSet` you have checks for Map, FlatMap, GroupReduce, to check that
no currently unsupported Lambdas are used.
Can you add the same checks for Join, Cross, CoGroup?
I will start working on a java-8 only subproject.
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