Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/861#issuecomment-114880501
Hello Theodore, the semantics for Discrete Histogram is such that you have
to specify what classes or discrete values are going to arrive. Once you fix
the allowed values, nothing else can be added except for updating counts of the
same values.
The idea is to emulate a discrete probability distribution, which it does.
For the continuous case, we're emulating a continuous probability distribution,
which means we can effectively add any value we want.
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