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https://issues.apache.org/jira/browse/FLINK-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora resolved FLINK-1591.
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Resolution: Fixed
> Remove window merge before flatten as an optimization
> -----------------------------------------------------
>
> Key: FLINK-1591
> URL: https://issues.apache.org/jira/browse/FLINK-1591
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Gyula Fora
> Assignee: Gyula Fora
>
> After a Window Reduce or Map transformation there is always a merge step when
> the transformation was parallel or grouped.
> This merge step should be removed when the windowing operator is followed by
> flatten to avoid unnecessary bottlenecks in the program.
> This feature should be added as an optimization step to the
> WindowingOptimizer class.
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