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Execute external exact work through QueryPlan DAG edges - #582
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Candidate-filtered exact work was prepared through a CandidateTopK-specific side path, so the installed QueryPlan graph did not govern its dependency ordering. This change adds an async physical DAG scheduler and executes language-neutral
ExternalExactleaves from their declared input edges. For example, CandidateTopK now reads candidate membership first, passes it to the external exact leaf throughCandidateMembership, and then composes both ordinary node outputs.Legacy logical exact leaves remain readable for existing serialized plans. New plans use
ExternalExact, reject an unavailable language adapter explicitly, retain request de-duplication, and preserve empty-candidate short-circuiting and request-size limits.Validation:
cargo check -p data_planecargo test -p data_plane exact_subqueries --lib(9 passed)