IT09673: XML QUERY MAY RETURN INCORRECT RESULT WHEN IT HAS OLAP AND ORDER BY

DB2 Version 11.1 Mod1 Fix Pack1 iFix001 for Linux, UNIX, and Windows
DB2 Version 11.1 Mod 2 Fix Pack 2 for Linux, UNIX, and Windows
DB2 Version 10.5 Fix Pack 9 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• An XML query may return incorrect result when it has all the
  following characteristics
    1. The query has a sub-select referencing OLAP function, such
  as rownum in Ora comparability mode, row_number() over (), etc.
    2. There is ORDER BY clause in the same or outer sub-select of
  the OLAP, and the columns in ORDER BY clause have expressions
  whose out-most function is XMLCAST.
  

Local fix

• Manually rewrite the query to compute the ORDER BY XMLCAST
  expression as close as possible to the base table access, and
  replace ORDER BY expression with simple column returned from
  inner sub-select.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * DB2 UDB Version 10.5                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Version 10.5 FixPack 8.                           *
  ****************************************************************
  

Problem conclusion

• Problem was first fixed in DB2 UDB Version 10.5 FixPack 8.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels