IT20898: QUERY AGAINST COLUMN ORGANIZED TABLE USING THE SAME DIVISION OPERATION IN NESTED CASE STATEMENTS CAN RECEIVE SQL0801N

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

APAR status

• Closed as program error.

Error description

• Using a query with nested CASE statements against Columnar
  Organized Tables including a division operation
  using column data can lead the query to end with :
   SQL0801N Division by zero was attempted
  
  example:
  CREATE TABLE test  ( test_col DECIMAL(29,16) ) ORGANIZE BY
  COLUMN;
  insert into test values (0),(NULL);
  SELECT
          CASE  WHEN result_1  IS NULL THEN -99999 ELSE
          CASE  WHEN result_1 = 0 THEN -99998 ELSE
          CASE  WHEN result_1 < 0 THEN -99996 ELSE (0 / result_1)
  END END END
  FROM (  SELECT
          CASE  WHEN test_col IS NULL  THEN NULL
                ELSE
                  (0/(CASE WHEN test_col IS NULL THEN 0 ELSE 1
  END))
                END AS result_1
                  FROM test
  )       ;
  

Local fix

• rewrite the query to avoid nested case statements with division
  over the same value
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * COLUMN ORGANIZED TABLES                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * See Error Description and install this fix.                  *
  ****************************************************************
  

Problem conclusion

• See Error Description and install this fix.
  

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

• RB10 PSY

     UP