|
Problem IC71704
|
Status: Closed |
DATE PREDICATES INCORRECTLY OPTIMIZED IN QUERY REWRITE. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - 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 users In V97 *
****************************************************************
* 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. *
****************************************************************
* RECOMMENDATION: *
* We recomend applying FP4. It might be possible to rewrite *
* the query to avoid the issue *
**************************************************************** |
| 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 9.7 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
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 |
Problem fixed first in FP4 |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC71959 IC71961
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 05.10.2010
19.05.2011
19.05.2011 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.4
|
 |
