Result r4 = db.execute("MATCH (l:lorry)-->(d:delivery) OPTIONAL MATCH (d)-->(f:food {name:'avocado'}) RETURN l.driver AS driver, f.count as count");
while (r4.hasNext()) {
    Map<String, Object> row = r4.next();
    System.out.println("driver: "+row.get("driver") + ", avocados: " + row.get("count"));
}