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DB2 - Problem description

Problem IT08045 Status: Closed

LAST_VALUE AND OLAP WINDOW OF "N FOLLOWING TO UNBOUNDED FOLLOWIN
G" COULD FAIL TO RETURN NULL WHERE WINDOW IS NO LONGER VALID.

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
LAST_VALUE with OLAP window of "n following to unbounded 
following" could return a value instead of NULL  for rows where 
window is no longer valid. 
 
example : 
 
create table minitestr (c1 int, c2 decimal); 
insert into minitestr values (24, 28.2735),(25, 25.1320); 
 
select c1, c2, last_value(c2) over 
       (order by c1 rows between 1 following and unbounded 
following) 
 from minitestr ; 
 
returns: 
 
C1          C2      3 
----------- ------- ------- 
         24     28.     25. 
         25     25.     25. 
 
  2 record(s) selected. 
 
 
but correct result is should have NULL for the last row in the 
3rd column: 
 
C1          C2      3 
----------- ------- ------- 
         24     28.     25. 
         25     25.       - 
 
  2 record(s) selected.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* OLAP LAST_VALUE                                              * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* install fix.                                                 * 
****************************************************************
Local Fix:
rewrite sql or install this fix.
Solution
See Error Description
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
31.03.2015
06.10.2015
06.10.2015
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.11 FixList
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