|
Problem IC71961
|
Status: Closed |
DATE PREDICATES INCORRECTLY OPTIMIZED IN QUERY REWRITE. |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
During query rewrite a date predicate is rewritten incorrectly.
The Date arithmetic is not properly applied and the resulting
optimized statement is not syntactically equivalent to the
original query.
For an example:
Original Statement:
------------------
select f02date
from datetbl
where (f02date + 2 month) = '2004-02-29'
Optimized Statement:
-------------------
SELECT Q1.F02DATE AS "F02DATE"
FROM MYSCHEMA.DATETBL AS Q1
WHERE (Q1.F02DATE = '12/29/2003')
As a result the return set will not contain rows that match the
predicate. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* DATE PREDICATES INCORRECTLY OPTIMIZED IN QUERY REWRITE. *
****************************************************************
* RECOMMENDATION: *
* Apply FP8 or use the indicated workaround *
**************************************************************** |
| Local Fix: |
Rewriting the query by placing all constant terms on one side of
the predicate might avoid the problem. |
| available fix packs: |
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 |
First fixed in v95 FP8 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 15.10.2010
27.06.2011
27.06.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.5.FP8
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.5.0.8
|
 |
