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DB2 - Problem description

Problem IC80062 Status: Closed

OPTIMIZER INCORRECT RESULTS FOR JOIN WITH REDUNDANT PREDICATES ON DPF

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
Different results for a query on DPF and non-DPF systems 
 
 
The following query returns no rows on non DPF , but 
incorrectly 2 rows on DPF 
 
WITH val (a1)   AS (VALUES ('')) ,def (a2,b2) AS (VALUES 
('dsf',''), 
('tsx','')) ,sel AS ( SELECT val.a1 ,'' AS c FROM val LEFT OUTER 
JOIN 
def ON def.a2 = '' ) SELECT def.a2 ,sel.a1 ,sel.c FROM def INNER 
JOIN 
sel ON def.a2 = sel.a1 AND def.b2 = '' ; 
 
 
(no tables required )
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 9.1 Fix Pack 12                       * 
****************************************************************
Local Fix:
set optimization level 1
Solution
Upgrade to DB2 version 9.1 Fix Pack 12
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

29.11.2011
31.10.2012
31.10.2012
Problem solved at the following versions (IBM BugInfos)
9.1.FP12
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.12 FixList