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https://issues.apache.org/jira/browse/SPARK-56406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18072150#comment-18072150
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Jungtaek Lim commented on SPARK-56406:
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Going to submit a PR.
> Stream-stream join v4: skip accessing secondary index for non-timestamp
> workload
> --------------------------------------------------------------------------------
>
> Key: SPARK-56406
> URL: https://issues.apache.org/jira/browse/SPARK-56406
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 4.2.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> For non-timestamp workload in stream-stream join v4, we don't really get
> benefit from having secondary index. The purpose of secondary index is
> eviction and non-timestamp workload does not perform eviction at all, hence
> we don't really need to read and update secondary index.
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