Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/861#issuecomment-137912454
I object to break API in this PR. I think that this PR should cover
histogram for `DataSet<Double>` only. That's why we split this PR from #1032.
About documentation, adding a document file such as `building_histogram.md`
first and merging it later would be good.
For Scala API, the current implementation looks good for me.
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