Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/861#issuecomment-132128284
+1 for having two different methods by return type but we need more
comments from @tillrohrmann, @thvasilo or other people because I'm not sure
this is best approach.
Would be okay the method names are `createContinuousHistogram` and
`createCategoricalHistogram` if we decide create two methods?
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