Gabor Gevay created FLINK-2148:
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             Summary: Approximately calculate the number of distinct elements 
of a stream
                 Key: FLINK-2148
                 URL: https://issues.apache.org/jira/browse/FLINK-2148
             Project: Flink
          Issue Type: Sub-task
            Reporter: Gabor Gevay
            Priority: Minor


In the paper
http://people.seas.harvard.edu/~minilek/papers/f0.pdf
Kane et al. describes an optimal algorithm for estimating the number of 
distinct elements in a data stream.



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