IT09595: SYSIBM.POWER ( EXPRESSION1, EXPRESSION2 ) WILL RETURN INCORRECT RESULTS FOR SOME VALUES WHEN THE BIGINT DATA TYPE IS USED

DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• The POWER scalar function will return incorrect results for
  certain values if at least one BIGINT argument is used.
  
  The following is a list of values that will produce incorrect
  results:
  
  Case (1) Argument 1 is 2 or -2 and argument 2 is -1.  The
  correct result is to be 1 if argument 1 is 2 and -1 if argument
  1 is -2, but 0 is returned instead.
  
  Case (2) Argument 1 is -1 and argument 2 is less than 0.  The
  correct result is to be -1 if argument 2 is odd and 1 if
  argument 2 is even, but 0 is returned instead.
  
  Case (3) Arguments 1 and 2 are both 0.  The correct result is 1,
  but an overflow error (SQL0802N; SQLSTATE=22003) is returned
  instead.
  
  For example, the value in each column should be -1, but instead
  the value in columns 2, 3, and 4 is 0.
  
  values(power(-1,-1), power(bigint(-1),-1), power(-1,bigint(-1)),
  power(bigint(-1),bigint(-1)))
  
  1           2                    3                    4
  ----------- -------------------- --------------------
  --------------------
           -1                    0                    0
  0
  
    1 record(s) selected.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users                                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to DB2 version 10.1.0.5.                             *
  ****************************************************************
  

Problem conclusion

• The problem is first fixed in DB2 version 10.1.0.5.
  

Temporary fix

Comments

APAR Information

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

  IT06646

• 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

• RA10 PSN

     UP