DB2 - Problembeschreibung
Problem IC75678 | Status: Geschlossen |
GROUP BY CLAUSE ON COLUMNS FROM ONE SOURCE INSIDE A SUBSELECT MAY NOT BE PUSHED DOWN IF THE SUBSELECT IS USED IN AN OUTER JOIN | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 | |
Problembeschreibung: | |
A GROUP BY clause specified on columns from a single source may not be fully optimized under certain conditions, which are: - The GROUP BY clause is used in a subselect - The subselect is used in an OUTER JOIN - The GROUP BY clause only groups columns from a single source - At least one of the columns in the GROUP BY clause defines uniqueness - The source of the columns is used in a join - All columns referenced in the output list of the subselect are simple, i.e., are not used in any expressions | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * A GROUP BY clause specified on columns from a single source * * may * * not be fully optimized under certain conditions, which are: * * * * - The GROUP BY clause is used in a subselect * * * * - The subselect is used in an OUTER JOIN * * * * - The GROUP BY clause only groups columns from a single * * source * * - At least one of the columns in the GROUP BY clause defines * * uniqueness * * * * - The source of the columns is used in a join * * * * - All columns referenced in the output list of the subselect * * are * * simple, i.e., are not used in any expressions * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 9.7 Fix Pack 5 or later. * **************************************************************** | |
Local-Fix: | |
The issue can be worked around by include one or more columns in the output list of the subselect in a no-op (no-operation) expression. For example, an integer column (c1) used in the output list of a subselect could be re-written as (c1+0). | |
verfügbare FixPacks: | |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows | |
Lösung | |
First fixed in DB2 Version 9.7 Fix Pack 5. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 07.04.2011 07.12.2011 07.12.2011 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.7.FP5 | |
Problem behoben lt. FixList in der Version | |
9.7.0.5 |