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DB2 - Problem description

Problem IC62742 Status: Closed

THE ROUND SCALAR FUNCTION CAN RETURN THE WRONG RESULT ON A DECFL OATINPUT
VALUES OF Infinity/-Infinity

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
The scenario can be re-created as follows: 
 
 
Table creation: create table dectest (col1 decfloat(34)); 
Insert special values like Infinity/-Infinity: insert into 
dectest values(Infinity),(-Infinity) 
 
The ROUND function may return Nan instead of Infinity/-Infinity. 
The output appears as follows: 
 
 
select col1,ROUND(col1,5) from dectest 
 
COL1        2 
 
------------------------------------------ 
------------------------------------------ 
     Infinity 
        NaN    (wrong result we expect Infinity) 
SQL0364W  DECFLOAT exception "INVALID OPERATION" has occurred 
during "BUILT-IN 
FUNCTION" operation.  SQLSTATE=0168D 
          -Infinity 
       NaN  (wrong result , expect: -Infinity) 
SQL0364W  DECFLOAT exception "INVALID OPERATION" has occurred 
during "BUILT-IN 
FUNCTION" operation.  SQLSTATE=0168D
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ROUND SCALAR  FUNCTION on DECFLOAT with INFINITY VALUE       * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* THE ROUND SCALAR  FUNCTION CAN RETURN THE WRONG RESULT ON A  * 
* DECFLOAT INPUT VALUES OF Infinity/-Infinity                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* install this fix                                             * 
****************************************************************
Local Fix:
Rewrite the SQL query  to have a case statement which avoids 
using the ROUND function on these 
special values.
available fix packs:
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
THE ROUND SCALAR  FUNCTION CAN RETURN THE WRONG RESULT ON A 
DECFLOAT INPUT VALUES OF Infinity/-Infinity. 
First Fixed in DB2 Version 9.5 Fix Pack 6a.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC64092 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
24.08.2009
14.05.2010
07.02.2011
Problem solved at the following versions (IBM BugInfos)
9.5.FP6
Problem solved according to the fixlist(s) of the following version(s)
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