Eric Marnadi created SPARK-55477:
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Summary: 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
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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