CREATE CONSTRAINT ON (u:User) ASSERT u.ourid IS UNIQUE;

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM "file:///some/path/neo4jplayground/initdata/fullset.csv" AS row
WITH row LIMIT 30

MERGE(u:User {ourid:row.user})

FOREACH (f IN split(row.friends, ",") |
  MERGE(u2:User {ourid:f})
  MERGE(u)-[:FRIEND]->(u2))