|
Problem IC63024
|
Status: Closed |
Twinning of LIKE predicate with generated BETWEEN predicate is not necessary when the column is wrapped with scalar function. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When a LIKE predicate column is wrapped with a scalar function,
e.g. LOWER(A2) LIKE 'a%', we cannot take advantage of applying
start/stop key with the generated BETWEEN predicate set, LOWER
(A2) <= StringHighValue AND LOWER(A2) >= StringLowValue.
Therefore, this fix will exclude the generation of BETWEEN
predicate to twin with the original LIKE predicate.
e.g.
Original Statement:
------------------
select * from a where lower(a2) like 'a%'
Optimized Statement:
-------------------
SELECT Q1.A1 AS "A1", Q1.A2 AS "A2"
FROM USER1.A AS Q1
WHERE (LOWER(Q1.A2) LIKE 'a%') |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* software *
****************************************************************
* PROBLEM DESCRIPTION: *
* Twinning of LIKE predicate with generated BETWEEN predicate *
* is *
* not necessary when the column is wrapped with scalar *
* function. *
****************************************************************
* RECOMMENDATION: *
* move to v97fp1 to overcome this issue *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
DB2 Version 9.7 Fix Pack 1 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 2 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3a for Linux, UNIX, and Windows
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 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 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 10 for Linux, UNIX, and Windows
|
| Solution |
fixed v97fp1 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 08.09.2009
04.02.2010
04.02.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP1
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.1
|
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