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https://issues.apache.org/jira/browse/SPARK-55477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18060395#comment-18060395
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Ignite TC Bot commented on SPARK-55477:
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User 'ericm-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/54257

> Add SequentialUnionManager to manage source activation 
> -------------------------------------------------------
>
>                 Key: SPARK-55477
>                 URL: https://issues.apache.org/jira/browse/SPARK-55477
>             Project: Spark
>          Issue Type: Task
>          Components: Structured Streaming
>    Affects Versions: 4.2.0
>            Reporter: Eric Marnadi
>            Priority: Major
>
> Add SequentialUnionManager, which manages state and lifecycle for 
> SequentialStreamingUnion nodes during streaming execution. The manager:
>  * Tracks which source is currently active in a sequential union
>  * Manages transitions between sources when exhaustion is detected
>  * Handles just-in-time preparation of sources with AvailableNow semantics
>  * Provides serializable offset representation for checkpoint recovery



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