bug in the concatenation of the selection...

From: Andres Cuevas <andcuevas(at)yahoo(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: bug in the concatenation of the selection...
Date: 2003-06-06 21:00:47
Message-ID: 20030606210047.74983.qmail@web10401.mail.yahoo.com
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CREATE TABLE foo ("key" int4 NOT NULL, "data1"
varchar(20), "data2" varchar(20));

INSERT INTO foo VALUES ('1','zzz');

SELECT * FROM foo ;
key | data1 | data2
-----+-------+-------
1 | zzz |
(1 row)

SELECT key || '|' || data1 || '|' || data2 FROM foo;
?column?
----------

(1 row)

If data1 or data2 are NULL the request is NULL

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