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DB2 - Problem description

Problem IC61794 Status: Closed

ST_PERPPOINTS RETURNS INCORRECT VALUES

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
When using the ST_PerpPoints spatial function on an 
ST_MultiLinestring geometry that contains multiple line 
segments, 
sometimes the values returned are incorrect. 
 
The following is an example of a query that returns an incorrect 
result: 
 
 values( 
  db2gse.ST_AsText ( 
     db2gse.ST_PerpPoints ( 
           db2gse.ST_MultiLineString('MULTILINESTRING ( 
                                           (-94 37.8, -93 37.8), 
                                           (-94 37.7, -94 37.3) 
                                    )',1), 
           db2gse.ST_Point('POINT (-94.5 37.5)',1) 
 
     ) 
  ) 
) 
 
Returns: 
MULTIPOINT (-94.248676 37.330745) 
 
The correct result is: 
MULTIPOINT (-94.000000 37.500000)
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All Spatial Extender users                                   * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* When using the ST_PerpPoints spatial function on an          * 
* ST_MultiLinestring geometry that contains multiple line      * 
*                                                              * 
* segments,                                                    * 
* sometimes the values returned are incorrect.                 * 
*                                                              * 
* The following is an example of a query that returns an       * 
* incorrectresult:                                             * 
*                                                              * 
*  values(                                                     * 
*  db2gse.ST_AsText (                                          * 
*    db2gse.ST_PerpPoints (                                    * 
*         db2gse.ST_MultiLineString('MULTILINESTRING (         * 
*            (-94 37.8, -93                                    * 
* 37.8),       (-94 37.7, -94                                  * 
* 37.3)       )',1),                                           * 
*   db2gse.ST_Point('POINT (-94.5 37.5)',1)                    * 
*                                                              * 
*  )                                                           * 
*     )                                                        * 
*  )                                                           * 
*                                                              * 
* Returns:                                                     * 
* MULTIPOINT (-94.248676 37.330745)                            * 
*                                                              * 
* The correct result is:                                       * 
* MULTIPOINT (-94.000000 37.500000)                            * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Apply V9.7 FP1                                               * 
****************************************************************
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
Apply V9.7 FP1
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
29.06.2009
07.10.2009
07.10.2009
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 FixList