Github user uce commented on the pull request:
https://github.com/apache/incubator-flink/pull/63#issuecomment-48443910
It already has the corresponding counterpart. But after your question I
realized that the Java API is lacking the count on grouped datasets, which the
Scala API supports.
```
input.count() // works
input.groupBy(...).count() // does not work
```
I will add it to this PR.
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