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https://issues.apache.org/jira/browse/FLINK-2143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora closed FLINK-2143.
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Resolution: Won't Fix
> 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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