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https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293609#comment-15293609
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Aljoscha Krettek commented on FLINK-2144:
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Right now we don't really have place in the doc where we would put such a
thing. We could either add such a section or add an example to to the builtin
Flink examples.
> 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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