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MIME-Version: 1.0
Date: Wed, 7 Oct 2009 22:25:20 -0400
Message-ID: <302670f20910071925g30322072oc9395e83d592ad2b@mail.gmail.com>
Subject: Function Anomaly?
From: Gary Chambers <gwchamb@gmail.com>
To: pgsql-sql@postgresql.org
Content-Type: text/plain; charset=ISO-8859-1

All...

Given the following type and function:

CREATE TYPE getnote_t AS (nid BIGINT, ownerid INTEGER, ownername
VARCHAR, hostname VARCHAR,
entrytime TIMESTAMP, is_active VARCHAR, is_private VARCHAR, notetext TEXT);

CREATE OR REPLACE FUNCTION getnote(INTEGER, BIGINT) RETURNS getnote_t AS
$getnote$
SELECT n.nid AS nid, n.ownerid AS ownerid, o.ownername AS ownername,
n.hostname AS hostname,
    n.entrytime::TIMESTAMP(0) AS entrytime,
    '[' || (CASE WHEN n.is_private = TRUE THEN 'PRIVATE' ELSE 'SHARED'
END) || ']' AS is_private,
    '[' || (CASE WHEN n.is_active = FALSE THEN 'INACTIVE' ELSE
'ACTIVE' END) || ']' AS is_active,
    n.notetext AS notetext
FROM notes n, owners o
WHERE (CASE WHEN (n.ownerid != $1 AND n.is_private IS TRUE) THEN FALSE
ELSE TRUE END)
    AND n.ownerid = o.ownerid AND n.nid = $2
$getnote$ LANGUAGE SQL;

When I call it with a row where n.is_private is TRUE and n.ownerid IS
TRUE, I receive a single row of all null values:

notesdb=# select * from getnote(1, 2);
 nid | ownerid | ownername | hostname | entrytime | is_active |
is_private | notetext
-----+---------+-----------+----------+-----------+-----------+------------+----------
     |         |           |          |           |           |            |
(1 row)

When I submit the query directly (getnote.sql is simply the query with
the CASE statement forced to false):

notesdb=# \i getnote.sql
 nid | ownerid | ownername | hostname | entrytime | is_private |
is_active | notetext
-----+---------+-----------+----------+-----------+------------+-----------+----------
(0 rows)

Thanks very much in advance for any insight you can provide.

-- Gary Chambers

/* Nothing fancy and nothing Microsoft! */