relationship aggregation
Collapsing the parallel relationships between two nodes into one during projection, usually carrying their count or sum as its weight.
Example
Ava bought a kettle and a mug. Ben bought six of the same mug.
cypher
MATCH (source:Customer)-[:BOUGHT]->(target:Product)
WITH source, target, count(*) AS purchases
RETURN gds.graph.project('customer-products', source, target, {
relationshipProperties: { weight: purchases }
})The projection holds one relationship for each pair of nodes.
Ben's six relationships to the mug become one carrying weight: 6. Ava bought each of two products once, so those come through carrying weight: 1. An algorithm reading weight still counts six purchases for Ben, without following six relationships to do it.
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