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

["Daniel Blazevski (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477990#comment-15477990 ] 

Daniel Blazevski edited comment on FLINK-2144 at 9/9/16 8:49 PM:
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Hi,

I am curious to know the status of this issue.  

I have worked on Flink-ML a bit, and recently contributed to Flink's documentation of its Window API.  

If possible, I would like to work on this.  I looked into the code and saw how "sum" is implemented, and I assume average and variance should be implemented in similar ways (with 2 versions, one taking a string another an integer).  Count, of course, is more simple in that it counts the number of data points (not two different inputs)

[~aljoscha][~ggevay]



was (Author: danielblazevski):
Hi,

I am curious to know the status of this issue.  

I have worked on Flink-ML a bit, and recently contributed to Flink's documentation of its Window API.  

If possible, I would like to work on this.  I looked into the code and saw how "sum" is implemented, and I assume average and variance should be implemented in similar ways (with 2 versions, one taking a string another an integer).  Count, of course, is more simple in that it counts the number of data points (not two different inputs)



> 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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