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https://issues.apache.org/jira/browse/FLINK-11456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rong Rong updated FLINK-11456:
------------------------------
Issue Type: Improvement (was: Sub-task)
Parent: (was: FLINK-11276)
> Improve window operator with sliding window assigners
> -----------------------------------------------------
>
> Key: FLINK-11456
> URL: https://issues.apache.org/jira/browse/FLINK-11456
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Reporter: Rong Rong
> Assignee: vinoyang
> Priority: Major
>
> With Slicing and merging operators that exposes the internals of window
> operators. current sliding window can be improved by eliminating duplicate
> aggregations or duplicate element insert into multiple panes (e.g.
> namespaces).
> The following sliding window operation
> {code:java}
> val resultStream: DataStream = inputStream
> .keyBy("key")
> .window(SlidingEventTimeWindow.of(Time.seconds(5L), Time.seconds(15L)))
> .sum("value")
> {code}
> can produce job graph equivalent to
> {code:java}
> val resultStream: DataStream = inputStream
> .keyBy("key")
> .sliceWindow(Time.seconds(5L))
> .sum("value")
> .slideOver(Count.of(3))
> {code}
>
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