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https://issues.apache.org/jira/browse/SPARK-35861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-35861.
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Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 33038
[https://github.com/apache/spark/pull/33038]
> Introduce "prefix match scan" feature on state store
> ----------------------------------------------------
>
> Key: SPARK-35861
> URL: https://issues.apache.org/jira/browse/SPARK-35861
> Project: Spark
> Issue Type: Sub-task
> Components: Structured Streaming
> Affects Versions: 3.2.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Fix For: 3.2.0
>
>
> We are proposing the new functionality in Structured Streaming’s state store,
> “prefix match scan”, to group the keys into logical groups, and scan the keys
> in the same group efficiently.
> This change is to enable us to construct the “logically list-like” data
> structure on top of the current state store, which only provides the
> operations for key-value. There’s an iterator in the state store to scan
> through the key space, but only supports full scan. Prefix match scan would
> open the possibility to scan on a specific range of the keys efficiently.
> This helps to simplify the state and also logic to the streaming session
> window, and also achieve similar performance (or even higher) than the
> approach we proposed before.
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