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https://issues.apache.org/jira/browse/FLINK-2143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226575#comment-15226575
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ASF GitHub Bot commented on FLINK-2143:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/856#issuecomment-205883786
@ggevay The windowing system changed a while back. Is this still valid or
can it be closed?
> Add an overload to reduceWindow which takes the inverse of the reduceFunction
> as a second parameter
> ---------------------------------------------------------------------------------------------------
>
> Key: FLINK-2143
> URL: https://issues.apache.org/jira/browse/FLINK-2143
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Gabor Gevay
> Assignee: Gabor Gevay
>
> If the inverse of the reduceFunction is also available (for example
> subtraction when summing numbers), then a PreReducer can maintain the
> aggregate in O(1) memory and O(1) time for evict, store, and emitWindow.
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