apoc.coll.flatten Function APOC Core apoc.coll.flatten(coll, [recursive]) - flattens list (nested if recursive is true) Signature apoc.coll.flatten(coll :: LIST? OF ANY?, recursive = false :: BOOLEAN?) :: (LIST? OF ANY?) Input parameters Name Type Default coll LIST? OF ANY? null recursive BOOLEAN? false Usage Examples The following flattens a collection of collections: RETURN apoc.coll.flatten([1,2,3,[4,5,6]]) AS output; Table 1. Results Output [1, 2, 3, 4, 5, 6] apoc.coll.fill apoc.coll.frequencies