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https://issues.apache.org/jira/browse/SPARK-34889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-34889:
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Assignee: (was: Apache Spark)
> Introduce MergingSessionsIterator merging elements directly which belong to
> the same session
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-34889
> URL: https://issues.apache.org/jira/browse/SPARK-34889
> Project: Spark
> Issue Type: Sub-task
> Components: Structured Streaming
> Affects Versions: 3.2.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> This issue tracks effort on introducing MergingSessionsIterator, which
> enables to merge elements belong to the same session directly. This would be
> quite performant compared to UpdatingSessionIterator. Note that
> MergingSessionsIterator can only apply to the cases aggregation can be
> applied altogether, so there're still rooms for UpdatingSessionIterator to be
> used.
> This issue also introduces MergingSessionsExec which is the physical node on
> leveraging MergingSessionsIterator to sort the input rows and aggregate rows
> according to the session windows.
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