Vlad Arkhipov <arhipov@xxxxxxxxxxxx> writes: > EXPLAIN ANALYZE > SELECT * > FROM i > WHERE d BETWEEN '2007-05-12' AND '2007-05-12' > Index Scan using i_d on i (cost=0.00..2.39 rows=1 width=402) (actual > time=0.053..4.284 rows=1721 loops=1) > Index Cond: ((d >= '2007-05-12'::date) AND (d <= '2007-05-12'::date)) > Total runtime: 6.645 ms > EXPLAIN ANALYZE > SELECT * > FROM i > WHERE d = '2007-05-12' > Index Scan using i_d on i (cost=0.00..38.97 rows=1572 width=402) > (actual time=0.044..4.250 rows=1721 loops=1) > Index Cond: (d = '2007-05-12'::date) > Total runtime: 6.619 ms Hmm, I wonder whether we shouldn't do something like this http://archives.postgresql.org/pgsql-committers/2008-03/msg00128.php for all range conditions, not just those made up by prefix_selectivity(). regards, tom lane
