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https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15350396#comment-15350396
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Wenlong Lyu edited comment on FLINK-2144 at 6/27/16 7:57 AM:
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we are also considering incremental aggregation solution for evicting window
currently, evicting window must re-compute all the data of the window, no
reducing state mechanism is available. It seems impossible to use fold function
to solve the problem. [~aljoscha]
was (Author: dragon.l):
we also consider increment agg for sliding window currently, evicting window
must re-compute all the data of the window, no reducing state mechanism is
available.
> 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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