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Posted to issues@flink.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2017/04/03 12:42:41 UTC

[jira] [Updated] (FLINK-2144) Incremental count, average, and variance for windows

     [ https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-2144:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> 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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