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https://issues.apache.org/jira/browse/FLINK-2148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628291#comment-14628291
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ASF GitHub Bot commented on FLINK-2148:
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Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/910#issuecomment-121663896
I planned to add a generic there :p why not DataStream[Long]
> 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
> Components: Streaming
> Reporter: Gabor Gevay
> Assignee: Gabor Gevay
> Priority: Minor
> Labels: statistics
>
> 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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