The following bug has been logged online:

Bug reference:      1408
Logged by:          andrzej
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.0.0-rc5
Operating system:   windows XP
Description:        don't see index
Details: 

Create table t1
(
 v varchar(5) not null,
 m varchar(20),
 d date,
 l varchar(10),
 primary key(v) 
);

explain select * from t1 where v='abc'
result:
Seq Scan on t1 (....
Filter:((v)::text='abc'::text)
DON'T SEE INDEX PKEY ???????!!!!

but Postgres 7.4.2 Linux
explain select * from t1 where v='abc'
result:
Index Scan using t1_pkey on t1(...
Index Cond((v)::text='abc'::text)
SEE INDEX PKEY OK !!!!!

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