I've got a query similar to this: select * from t1, t2 where t1.id > 158507 and t1.id = t2.id;
That took > 84 minutes (the query was a bit longer but this is the part that made the difference) after a little change the query took ~1 second: select * from t1, t2 where t1.id > 158507 and t2.id > 158507 and t1.id = t2.id; The change is pretty simple and it seems (note I don't have a clue on how the planner works) it'd be possible for the planner to make this assumption itself. Do you think it is really feasible/appropiate? -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
