[SPARK-55477] Add SequentialUnionManager for managing sequential source processing#54257
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ericm-db wants to merge 1 commit intoapache:masterfrom
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[SPARK-55477] Add SequentialUnionManager for managing sequential source processing#54257ericm-db wants to merge 1 commit intoapache:masterfrom
ericm-db wants to merge 1 commit intoapache:masterfrom
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This adds 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 Key design points: - Sequential draining: Each non-final source is prepared with AvailableNow, drained to exhaustion, then transitions to the next source - Just-in-time preparation: Sources are prepared immediately before draining to capture the freshest bound point - Checkpoint integration: State is serialized as SequentialUnionOffset for durability across restarts This is a foundational component for the sequential union execution feature, which enables backfill-to-live streaming scenarios.
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What changes were proposed in this pull request?
This adds SequentialUnionManager, which manages state and lifecycle for SequentialStreamingUnion nodes during streaming execution. The manager:
Why are the changes needed?
This component manages source activation for Sequential Union
Does this PR introduce any user-facing change?
No
How was this patch tested?
Unit tests
Was this patch authored or co-authored using generative AI tooling?
No