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https://issues.apache.org/jira/browse/BEAM-2728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles resolved BEAM-2728.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

I'd say this is resolved - we've got the extension and it is going out with 
2.3.0

> Extension for sketch-based statistics
> -------------------------------------
>
>                 Key: BEAM-2728
>                 URL: https://issues.apache.org/jira/browse/BEAM-2728
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-extensions
>            Reporter: Arnaud Fournier
>            Assignee: Arnaud Fournier
>            Priority: Minor
>             Fix For: 2.3.0
>
>          Time Spent: 6.5h
>  Remaining Estimate: 0h
>
> Goal : Provide an extension library to compute approximate statistics on 
> streams.
> Interest : Probabilistic data structures can create an approximation (sketch) 
> of the current state of a stream without storing every element but rather 
> processing each observation quickly to summarize its current state and find 
> useful statistical insights.
> Implementation is here : 
> https://github.com/ArnaudFnr/beam/tree/sketching/sdks/java/extensions/sketching
> More info : 
> https://docs.google.com/document/d/1Xy6g5RPBYX_HadpIr_2WrUeusiwL0Jo2ACI5PEOP1kc/edit



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