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https://issues.apache.org/jira/browse/SPARK-34892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-34892:
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Assignee: Apache Spark
> Introduce MergingSortWithSessionWindowStateIterator sorting input rows and
> rows in state efficiently
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-34892
> URL: https://issues.apache.org/jira/browse/SPARK-34892
> Project: Spark
> Issue Type: Sub-task
> Components: Structured Streaming
> Affects Versions: 3.2.0
> Reporter: Jungtaek Lim
> Assignee: Apache Spark
> Priority: Major
>
> This issue tracks effort on introducing
> MergingSortWithSessionWindowStateIterator which will ensure the sort order
> between input rows and rows in state via efficient way.
> MergingSortWithSessionWindowStateIterator will require precondition that
> input rows are sorted, and assume that the number of rows in state per group
> key will be small. As the name represents, the iterator will do merge sort
> between twos and provide elements one by one.
> The precondition will be guaranteed via physical node, and the assume is most
> likely true unless watermark gap is specified like hours and there're quite
> lots of old but not late input rows.
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