Eric Marnadi created SPARK-55123:
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Summary: Add SequentialUnionOffset for tracking sequential source
processing
Key: SPARK-55123
URL: https://issues.apache.org/jira/browse/SPARK-55123
Project: Spark
Issue Type: Task
Components: Structured Streaming
Affects Versions: 4.2.0
Reporter: Eric Marnadi
Add SequentialUnionOffset class to support Sequential Union operations in
Structured Streaming. This offset type enables tracking the state of sequential
source processing in backfill-to-live streaming scenarios.
The implementation includes:
* SequentialUnionOffset case class that extends OffsetV2
* Name-based source tracking (not index-based) for stability across query
restarts
* Validation logic to ensure correctness of offset state
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