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https://issues.apache.org/jira/browse/SPARK-55630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-55630.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 54854
[https://github.com/apache/spark/pull/54854]
> Skip updating matched flag on non-outer side of stream-stream join
> ------------------------------------------------------------------
>
> Key: SPARK-55630
> URL: https://issues.apache.org/jira/browse/SPARK-55630
> Project: Spark
> Issue Type: Task
> Components: Structured Streaming
> Affects Versions: 4.2.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> Updating matched flag in stream-stream join triggers write(s) during
> retrieval of the matching values. While this is required for outer join side
> to track the unmatched output, it's unnecessary to track the matched flag for
> non-outer join side - the cost of updating matched flag is significant. For
> non-outer join side, we can skip updating the matched flag.
> Applying this optimization would break the case of changing join type during
> restarting of the query, but we do not have an explicit support of it, so
> this optimization does not break the actual use case.
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