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https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Gevay resolved FLINK-2144.
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Resolution: Won't Fix
> 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: DataStream API
> 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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