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https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293562#comment-15293562
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Aljoscha Krettek commented on FLINK-2144:
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I think this can easily be done by users in a window with a {{FoldFunction}}.
Doing it in a generic way as in the aggregation functions on {{WindowedStream}}
will never be as fast as a custom implementation.
I would vote to close this issue.
> Incremental count, average, and variance for windows
> ----------------------------------------------------
>
> Key: FLINK-2144
> URL: https://issues.apache.org/jira/browse/FLINK-2144
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Reporter: Gabor Gevay
> Priority: Minor
> Labels: statistics
>
> By count I mean the number of elements in the window.
> These can be implemented very efficiently building on FLINK-2143:
> Store: O(1)
> Evict: O(1)
> emitWindow: O(1)
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