Github user stefanobaghino commented on the pull request:
https://github.com/apache/flink/pull/1704#issuecomment-204334976
Note on the tests of the streaming extensions: I couldn't find a more
specific class than `SingleOutputStreamOperator[_]`, thus assertion may not be
very meaningful. However, I'd leave them in place to make sure further work on
the extension won't break them at compile time.
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