Maybe this example will help: row[4] here contains a collection (which
length varies between lines from 0 to some N) of primary keys (stored
inside nodes in corresponding string properties) separated by ';' and
builds relationships from the node which has primary key eq row[0] to every
node from that collection
LOAD CSV FROM "file:///home/stesin/preprocessed.csv" AS row
WITH row[0] AS key, SPLIT(row[4], ';') AS k0
UNWIND k0 AS k
WITH key, k
MATCH
(o:P {primary_key: key}), (oo:P {primary_key: k})
MERGE
(o)<-[r:KNOWS]-(oo);
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