feat(core): scaffold PrefixMergeExec for cross-partition windowed-aggregate state merge - #2211

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avantgardnerio:brent/prefix-merge-scaffold

Commits on Jul 30, 2026

feat(core): scaffold PrefixMergeExec for cross-partition windowed-aggregate state merge

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docs(prefix-merge): clarify scheduler/executor division of labor

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feat(prefix-merge): add WindowApply / ScalarOp descriptors for per-column apply

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feat(prefix-merge): implement WindowApply::Aggregate — real per-row seeded merge

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test(prefix-merge): add AVG cross-partition demo

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feat(prefix-merge): implement WindowApply::Scalar via arrow kernels + SUM demo

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refactor(prefix-merge): drop PARTITION BY keying to match DF-side simplification

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