DB2 - Problembeschreibung
Problem IT01660 | Status: Geschlossen |
INCORRECT RESULTS MIGHT BE PRODUCED WITH PREDICATES INVOLVING NULL CONSTANTS | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 | |
Problembeschreibung: | |
Under rare scenarios, DB2 might produce an incorrect result if the following conditions are true: 1) The query contains a NULL constant in predicate 2) The predicate is of the form expression <relop> NULL where <relop> can be =,>=,<= 3) The expression is either a CASE expression or a NULLIF function 4) The output of the expression is guaranteed to be NULL eg. select * from t1 where NULLIF (c1, c1) >= Cast(NULL as int); select * from t1 where case when c1 = c1 then NULL else c1 end >= cast(NULL as BIGINT); | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * All users * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 version 9.7.0.10. * **************************************************************** | |
Local-Fix: | |
1) drop the redundant predicate 2) Change the query optimization level to 0 | |
Lösung | |
The problem is first fixed in DB2 version 9.7.0.10. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 08.05.2014 08.12.2014 21.04.2015 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.7.0.10 | |
Problem behoben lt. FixList in der Version | |
9.7.0.10 |