pub fn build_relationships_plan(
sources: RelationshipSources,
window: &GraphQueryWindow,
) -> Result<Option<LogicalPlan>>Expand description
Builds the semantic_relationships plan: the service-calls, agent-calls,
co-declared, and declared-edge branches unioned and re-projected to the
18-column contract. Returns None when no source can contribute edges, so
the computed table streams empty.