Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/627#issuecomment-96580250
Wow, very nice :-) Looks correct from a first glance (I did not thoroughly
check everything).
One remark: Since `print()` may become an eagerly evaluated command in the
future, the tests become more robust when using `.output(new
DiscardingOutputFormat())` as the sink.
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