IT20720: TRUNCATING CAST TO (VAR)CHAR AGAINST A COLUMNAR ORGANIZED TABLECOULD RETURN DANGLING BYTE INSTEAD OF A BLANK CHARACTER.

Db2 Version 11.1 Mod2 Fix Pack2 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix002 for Linux, UNIX, and Windows
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
Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• example:
  create table t1(a graphic(64)) organize by column
  insert into t1 values
  (X'e0b885e0b886e0b887e0b885e0b886e0b885e0b886e0b885e0b886e0b885e
  0b886e0b885e0b886e0b885e0b886')
  
  SELECT  hex(CAST(a AS CHAR(10)))  FROM t1
  
  returns xE0B885E0B886E0B887E0
  
  where last byte, xE0 is partial and not a valid character.
  
  we should have returned
  
  xE0B885E0B886E0B88720
  
  WHERE last x20 is a blank and it replaced partial xE0
  

Local fix

• Using optimizer guidelines change the plan to push the work into
  rowstore , which will return correct blank.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 Mod 2 Fix Pack 2 iFix001 or higher       *
  ****************************************************************
  

Problem conclusion

• First fixed in Db2 11.1 Mod 2 Fix Pack 2 iFix001
  

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:

  IT20851

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels