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https://issues.apache.org/jira/browse/SPARK-45558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-45558.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 43393
[https://github.com/apache/spark/pull/43393]
> Introduce a metadata file for streaming stateful operator
> ---------------------------------------------------------
>
> Key: SPARK-45558
> URL: https://issues.apache.org/jira/browse/SPARK-45558
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.5.0
> Reporter: Chaoqin Li
> Assignee: Chaoqin Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> The information to store in the metadata file:
> * operator name (no need to be unique among stateful operators in the query)
> * state store name
> * numColumnsPrefixKey: > 0 if prefix scan is enabled, 0 otherwise
> The body of metadata file will be in json format. The metadata file will be
> versioned just as other streaming metadata file to be future proof.
> The metadata file will improve expose more information about the state store,
> improves debugability and facilitate the development of state related feature
> such as reading and writing state and state repartitioning.
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