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Problem IC80061
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Status: Closed |
OPTIMIZER INCORRECT RESULTS FOR JOIN WITH REDUNDANT PREDICATES ON DPF |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - 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 9.7 Fix Pack 6 *
**************************************************************** |
| Local Fix: |
set optimization level 1 |
| available fix packs: |
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
This APAR is fixed in DB2 version 9.7 Fix Pack 6. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 29.11.2011
12.06.2012
12.06.2017 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.6
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