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IDS Forum

Re: SELECT CASE on NULL doesn't work (bug B165879)

Posted By: Jonathan Leffler
Date: Wednesday, 4 February 2004, at 4:09 p.m.

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Oops - red face time! :-(

I managed to get two errors in my commentary on this issue (originally
posted in just classics@iiug.org).
1. I got the logic in my test case inverted.
2. I managed to get the wrong version numbers out.

I have entered B165879 in PTS for this. I've confirmed the problem in =
IDS
7.31.UD5 on Solaris 8; I've confirmed the absence of the problem in IDS=

9.21.UC1, 9.30.UC3, 9.40.UC1. June Hunt said it was not a problem in
9.20.UC3. It appears, then, to be an issue only in the 7.31 versions o=
f
IDS.

Gary Holeman - you reported the problem initially; please can you confi=
rm
that you were working with an IDS 7.31 (or, perish the thought, IDS 7.3=
0)
server?

My reproduction script is:

CREATE TABLE id_rec (id INTEGER NOT NULL PRIMARY KEY, fullname VARCHAR(=
30)
NOT NULL);
CREATE TABLE pers_rec(id INTEGER NOT NULL REFERENCES id_rec(id) PRIMARY=

KEY);
INSERT INTO id_rec VALUES(1, "Mr Floozy");

-- Correct answer has status =3D "*IS NULL"
-- Incorrect answer has status =3D "NOT NULL"

-- Informix Outer join
SELECT i.fullname, p.id, CASE p.id WHEN NULL THEN "*IS NULL" ELSE "NOT
NULL" END AS STATUS
FROM id_rec i, OUTER pers_rec p WHERE i.id =3D p.id;

-- ISO Outer join
SELECT i.fullname, p.id, CASE p.id WHEN NULL THEN "*IS NULL" ELSE "NOT
NULL" END AS STATUS
FROM id_rec AS i LEFT JOIN pers_rec AS p ON i.id =3D p.id;

--
Jonathan Leffler (jleffler@us.ibm.com)
STSM, Informix Database Engineering, IBM Data Management
4100 Bohannon Drive, Menlo Park, CA 94025
Tel: +1 650-926-6921 Tie-Line: 630-6921
"I don't suffer from insanity; I enjoy every minute of it!"
=

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<html><body>
<p>Oops - red face time! :-(<br>
<br>
I managed to get two errors in my commentary on this issue (originally =
posted in just classics@iiug.org).<br>
1. I got the logic in my test case inverted.<br>
2. I managed to get the wrong version numbers out.<br>
<br>
I have entered B165879 in PTS for this. I've confirmed the problem in =
IDS 7.31.UD5 on Solaris 8; I've confirmed the absence of the problem in=
IDS 9.21.UC1, 9.30.UC3, 9.40.UC1. June Hunt said it was not a problem=
in 9.20.UC3. It appears, then, to be an issue only in the 7.31 versio=
ns of IDS.<br>
<br>
Gary Holeman - you reported the problem initially; please can you confi=
rm that you were working with an IDS 7.31 (or, perish the thought, IDS =
7.30) server?<br>
<br>
My reproduction script is:<br>
<br>
<font face=3D"Courier New">CREATE TABLE id_rec (id INTEGER NOT NULL PRI=
MARY KEY, fullname VARCHAR(30) NOT NULL);</font><br>
<font face=3D"Courier New">CREATE TABLE pers_rec(id INTEGER NOT NULL RE=
FERENCES id_rec(id) PRIMARY KEY);</font><br>
<font face=3D"Courier New">INSERT INTO id_rec VALUES(1, &quot;Mr Floozy=
&quot;);</font><br>
<br>
<font face=3D"Courier New">-- Correct answer has status =3D &quot;*IS N=
ULL&quot;</font><br>
<font face=3D"Courier New">-- Incorrect answer has status =3D &quot;NOT=
NULL&quot;</font><br>
<br>
<font face=3D"Courier New">-- Informix Outer join</font><br>
<font face=3D"Courier New">SELECT i.fullname, p.id, CASE p.id WHEN NULL=
THEN &quot;*IS NULL&quot; ELSE &quot;NOT NULL&quot; END AS STATUS</fon=
t><br>
<font face=3D"Courier New"> FROM id_rec i, OUTER pers_rec p WHERE i.id =
=3D p.id;</font><br>
<br>
<font face=3D"Courier New">-- ISO Outer join</font><br>
<font face=3D"Courier New">SELECT i.fullname, p.id, CASE p.id WHEN NULL=
THEN &quot;*IS NULL&quot; ELSE &quot;NOT NULL&quot; END AS STATUS</fon=
t><br>
<font face=3D"Courier New"> FROM id_rec AS i LEFT JOIN pers_rec AS p ON=
i.id =3D p.id;</font><br>
<br>
--<br>
Jonathan Leffler (jleffler@us.ibm.com)<br>
STSM, Informix Database Engineering, IBM Data Management<br>
4100 Bohannon Drive, Menlo Park, CA 94025<br>
Tel: +1 650-926-6921 Tie-Line: 630-6921<br>
&quot;I don't suffer from insanity; I enjoy every minute of it!&q=
uot;<br>
<br>
</body></html>=

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