Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/861#issuecomment-114893705
Actually, how about making the Categorical Histogram completely online too?
We could just take a numClasses there too, with a semantic difference that in
this case the number of buckets would be absolute, with a count and _real_
value associated with each bucket. The internal data structure would be a
hashmap now, with the maximum allowed size numClasses.
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