The following bug has been logged online:
Bug reference: 5123
Logged by: Andrey
Email address: andrey@ulab.ru
PostgreSQL version: 8.4.1-x86_64
Operating system: RHEL5-x86_64
Description: bug in window function "last_value"
Details:
EXAMPLE:
CREATE TABLE t
(
id serial NOT NULL,
CONSTRAINT pkey_t PRIMARY KEY (id)
)
WITH (OIDS=FALSE);
INSERT INTO t VALUES(default);
INSERT INTO t VALUES(default);
INSERT INTO t VALUES(default);
select id, first_value(id) over(order by id), last_value(id) over(order by
id) from t;
RESULT:
id | first_value | last_value
----+-------------+------------
1 | 1 | 1
2 | 1 | 2
3 | 1 | 3
(3 rows)
fist_value - good, last_value - bad
