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DB2 - Problem description

Problem IT04307 Status: Closed

INCORRECT RESULTS FROM A COLUMN-ORGANIZED TABLE WHEN OPERATIONS INCLUDE
NEGATIVE FLOAT/DOUBLE VALUES AND A RESULT OF ZERO

product:
DB2 FOR LUW / DB2FORLUW / A50 - DB2
Problem description:
If an arithmetic expression occurs between negative floating 
point values that yields a 0 result, then the query may return 
incorrect results for a column-organized table. 
 
The following is an example of an operation that could give a 
wrong result: 
 
create table test (col1 integer, col2 float, col3 int, col4 
float) organize by column; 
DB20000I  The SQL command completed successfully. 
 
insert into test values (0,1,0,-1); 
DB20000I  The SQL command completed successfully. 
 
select (col1/col2),(col3/col4) from test; 
 
1                        2 
------------------------ ------------------------ 
  +0.00000000000000E+000   +0.00000000000000E+000 
 
  1 record(s) selected. 
 
unexpected result: 
 
select * from (select col1/col2 as a ,col3/col4 as b from test) 
where a=b; 
 
A                        B 
------------------------ ------------------------ 
 
  0 record(s) selected. 
 
With the fix: 
 
select * from (select col1/col2 as a ,col3/col4 as b from test) 
where a=b; 
 
A                        B 
------------------------ ------------------------ 
  +0.00000000000000E+000   +0.00000000000000E+000 
 
  1 record(s) selected.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 10.5.0.5.                             * 
****************************************************************
Local Fix:


Solution


The problem is first fixed in DB2 version 10.5.0.5.


Workaround


not known / see Local fix


Timestamps


Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

09.09.2014
09.04.2015
09.04.2015


Problem solved at the following versions (IBM BugInfos)




Problem solved according to the fixlist(s) of the following version(s)


10.5.0.5

FixList