A query plan in PostgreSQL with a hash join

gistfile1.txt

padraig=# explain select t2.text from t1, t2 where t1.id = t2.id;
                          QUERY PLAN
--------------------------------------------------------------
 Hash Join  (cost=1.07..2.16 rows=4 width=21)
   Hash Cond: (t2.id = t1.id)
   ->  Seq Scan on t2  (cost=0.00..1.04 rows=4 width=25)
   ->  Hash  (cost=1.03..1.03 rows=3 width=4)
         ->  Seq Scan on t1  (cost=0.00..1.03 rows=3 width=4)
(5 rows)

padraig=#