PM50325: INCORRECT OUTPUT WHEN USING A DECLFOAT COLUMN IN AN XML INDEX

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Incorrout can occur when a DECFLOAT XML index is used to filter
  an XPath predicate which contains the integer comparison
  operators "=", "<=", or "<".
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of DB2 9 or DB2 10 for z/OS that use   *
  *                 an XML index, or users of DB2 10 for z/OS    *
  *                 that use XMLEXISTS.                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: (1) INCORROUT may occur if using an XML *
  *                      index with a decfloat data type.        *
  *                      (2) INCORROUT may occur if using        *
  *                      XMLEXISTS with XQuery.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The following example illustrates the first problem,
  
  CREATE TABLE T1 (ID INTEGER, DOC XML);
  CREATE INDEX INDX1 ON T1 (DOC)
      GENERATE KEY USING XMLPATTERN '/a/b/c' AS SQL DECFLOAT;
  INSERT INTO T1 (ID, DOC) VALUES(1,
                           '<a><b><c>-20.12345</c></b></a>');
  SELECT T1.ID, X.*
  FROM T1, XMLTABLE('$x/a/b' PASSING T1.DOC AS "x"
           COLUMNS
              C0 DECIMAL(10, 3) PATH 'c'
            ) X
  WHERE X.C0 = -20.123;
  
  SELECT  -20  FROM T1
  WHERE XMLEXISTS(
     '$x/a/b (xs:integer(xs:decimal(c)) = -20) '
     PASSING T1.DOC AS "x")   ;
  
  For the above two queries, no rows are returned without
  applying this APAR. However, the correct results should have
  one row returned for each query.
  
  The following query illustrates the second problem,
  SELECT XMLQUERY('
       for $i in $x/a/b
       where $i/c > -200
       return $i' PASSING T1.DOC AS "x")
  FROM T1
  WHERE XMLEXISTS('
       for $i in $x/a/b
       where $i/c > -200
       return $i' PASSING T1.DOC AS "x")
  No rows are returned if the APAR is not applied, though the
  correct output should have one row.
  
  Additional keywords: XMLINCORR SQLPREDPUSHDOWN SQLXML XMLINDEXES
                       DB2INCORR/K
  

Problem conclusion

• DB2 code is modified so that the correct output will be returned
  for the above queries.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UK74966 UK74967

Modules/Macros

• DSNXQMCH DSNXQXQ2
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK74966

     UP12/01/04 P F201

• R910 PSY UK74967

     UP12/01/04 P F201

Fix is available

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