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DB2 - Problem description
| Problem IC80060 | Status: Closed |
OPTIMIZER INCORRECT RESULTS FOR JOIN WITH REDUNDANT PREDICATES ON DPF | |
| product: | |
DB2 FOR LUW / DB2FORLUW / 950 - 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 V9.5 Fix Pack 9 or later * **************************************************************** | |
| Local Fix: | |
set optimization level 1 | |
| available fix packs: | |
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows | |
| Solution | |
Problem first fixed in DB2 V9.5 Fix Pack 9 | |
| 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) | |
9.5.FP9 | |
| Problem solved according to the fixlist(s) of the following version(s) | |
| 9.5.0.9 |
|