Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/910#issuecomment-121654093
> -Why the output of the distinct methods are not DataStream
They do output DataStream. (<T> is their generic parameter.)
> -Why don't we have a distinct method that does not take a field-position,
so counting the true distinct elements in the stream
That's a good idea, I have added it now.
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