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Why is the subselect never executed for the inner select?
pgrocks=> SELECT VERSION() UNION ALL SELECT oid::text FROM pg_class WHERE ctid =
(SELECT ctid FROM pg_class LIMIT 1);
version
--------------------------------------------------------------
PostgreSQL 7.3.4 on i686-pc-linux-gnu, compiled by GCC 3.0.1
16416
(2 rows)
pgrocks=> SELECT VERSION() UNION ALL SELECT oid::text FROM pg_class WHERE ctid =
(SELECT ctid FROM pg_class LIMIT 1);
version
-----------------------------------------------------------------
PostgreSQL 7.4beta3 on i686-pc-linux-gnu, compiled by GCC 3.0.1
(1 row)
7.3.4:
pgrocks=> EXPLAIN ANALYZE SELECT oid FROM pg_class WHERR ctid = (SELECT ctid FROM
pg_class LIMIT 1);
QUERY PLAN
------------------------------------------------------------------------------------------------------
Tid Scan on pg_class (cost=0.00..4.01 rows=1 width=4) (actual time=0.01..0.01 rows=1
loops=1)
Filter: (ctid = $0)
InitPlan
-> Limit (cost=0.00..0.03 rows=1 width=6) (actual time=0.02..0.03 rows=1
loops=1)
-> Seq Scan on pg_class (cost=0.00..21.82 rows=682 width=6) (actual
time=0.02..0.02 rows=2 loops=1)
7.4beta3:
pgrocks=> EXPLAIN ANALYZE SELECT oid FROM pg_class WHERR ctid = (SELECT ctid FROM
pg_class LIMIT 1);
QUERY PLAN
------------------------------------------------------------------------------------------------
Tid Scan on pg_class (cost=0.04..4.05 rows=2 width=4) (actual time=0.00..0.00 rows=0
loops=1)
Filter: (ctid = $0)
InitPlan
-> Limit (cost=0.00..0.04 rows=1 width=6) (never executed)
-> Seq Scan on pg_class (cost=0.00..9.30 rows=230 width=6) (never executed)
--
Greg Sabino Mullane [EMAIL PROTECTED]
PGP Key: 0x14964AC8 200309251929
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