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

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

--0__=08BBE4A3DFE146CE8f9e8a93df938690918c08BBE4A3DFE146CE
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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!"
=

--0__=08BBE4A3DFE146CE8f9e8a93df938690918c08BBE4A3DFE146CE
Content-type: text/html; charset=US-ASCII
Content-Disposition: inline
Content-transfer-encoding: quoted-printable

<html><body>
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 versio=
ns of 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 =
7.30) server? 
 
My reproduction script is: 
 
CREATE TABLE id_rec (id INTEGER NOT NULL PRI=
MARY KEY, fullname VARCHAR(30) NOT NULL); 
CREATE TABLE pers_rec(id INTEGER NOT NULL RE=
FERENCES id_rec(id) PRIMARY KEY); 
INSERT INTO id_rec VALUES(1, "Mr Floozy=
"); 
 
-- Correct answer has status =3D "*IS N=
ULL" 
-- 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</fon=
t> 
 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</fon=
t> 
 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!&q=
uot; 
 
</body></html>=

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Messages In This Thread

Re: SELECT CASE on NULL doesn't work (bug B165879)
Jonathan Leffler -- Wednesday, 4 February 2004, at 4:09 p.m.
- Re: SELECT CASE on NULL doesn't work (bug B165879)
  Scott MacKenzie -- Wednesday, 4 February 2004, at 5:00 p.m.

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