Loading distinct nodes and relationships with patterns in Neo4J 4.0

nodes_and_relationships_of pattern.cypher

call {
	match p=()--()--() return
	reduce(ns = [], n in collect(nodes(p)) | ns + n) as ns,
	reduce(rs = [], r in collect(relationships(p)) | rs + r) as rs
}
call { with ns unwind ns as n return collect(distinct n) as nodes }
call { with rs unwind rs as r return collect(distinct r) as relationships }
return {nodes: nodes, relationships: relationships}