PM80699: SQLINCORROUT WHEN GROUP BY LIST CONTAINS COLUMN AND COLUMN EXPRESSION WHICH REFERENCES AND SHOWS BEFORE THE COLUMN

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Incorrout may happen when query contains group by list and
  the list contains a column and a column expression which
  references the column and shows before the column.
  

Local fix

• REVERSE THE COLUMN AND THE COLUMN EXPRESSION.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 9 and 10 for z/OS users whose queries    *
  *                 contain a GROUP BY list which has a SUBSTR   *
  *                 or YEAR function as well as the column       *
  *                 referenced by the function.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Incorrect output may be returned for a  *
  *                      query with a GROUP BY list which has    *
  *                      a SUBSTR or YEAR function and the       *
  *                      column referenced by the function.      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Incorrect output may be returned for a query with a GROUP BY
  list if all the following conditions are satisfied:
  
  1. The GROUP BY list contains a SUBSTR or YEAR function as well
  as the column referenced by the function;
  
  2. The function appears before the column it references in the
  GROUP BY list;
  
  3. The function preserves the order of the column it
  references;
  
  4. There is an index supporting the avoidance of the GROUP BY
  sort and the index is selected.
  
  For example,
  
  SELECT SUBSTR(C1,1,4), C1, COUNT(*)
  FROM T1
  GROUP BY SUBSTR(C1,1,4), C1;
  
  C1 is a CHAR(10) column. There is an index IX1 created on T1.C1.
  The DB2 optimizer may select an access path without sort if IX1
  is used to access T1 because SUBSTR(C1,1,4) preserves the order
  of C1.  Incorrect output may occur for the query above.
  
  Additional Keywords:
  SQLINCORR SQLINCORROUT INCORROUT DB2INCORR/K SQLGROUPBY
  SQLSUBSTR SQLYEAR
  

Problem conclusion

• Code has been fixed to give correct output for queries
  described above.
  

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:

  UK92539 UK92540

Modules/Macros

• DSNXOPRP
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK92539

     UP13/04/02 P F304

• R910 PSY UK92540

     UP13/04/02 P F304

Fix is available

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