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https://issues.apache.org/jira/browse/SPARK-34427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284041#comment-17284041
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Jungtaek Lim commented on SPARK-34427:
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You'd need to provide the actual use case (yes, user requirement) of session
window, as previous concern was that in most cases the session is not only
defined as a inactivity gap and they ended up with implementing their own via
flatMapGroupsWithState.
> Session window support in SS
> ----------------------------
>
> Key: SPARK-34427
> URL: https://issues.apache.org/jira/browse/SPARK-34427
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Affects Versions: 3.2.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
>
> Currently structured streaming supports two kinds of windows: tumbling window
> and sliding window. Another useful window function is session window. Which
> is not supported by SS. We have user requirement to use session window. We'd
> like to have this support in the upstream.
> About session window, there is some info:
> https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/operators/windows.html#session-windows.
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