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IT18202: WRONG RESULT IS POSSIBLE IF GENERATED ALWAYS EXPRESSION REFERENCES A BUILT-IN FUNCTION WITH MORE THEN ONE STRING INPUT

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APAR status

  • Closed as fixed if next.

Error description

  • Insert or update may cause wrong result when the target table
    has a GENERATED ALWAYS expression that references a built-in
    function with more than one string input.
    
    example:
    
    create table t1 (
      i int,
      c1 varchar (18),
      c2 varchar (18) GENERATED ALWAYS AS
         (sysibm.ltrim( c1, X'E6BCA2' ) ));
    
    
    create or replace variable v varchar(18) for bit data;
    
    set v = X'E6BCA2E6BCA1';
    
    insert into t1 values (1, v, default );
    insert into t1 values (2, X'E6BCA2E6BCA1', default );
    
    select hex(c1), hex(c2 ) from t1 order by i;
    
    1                                    2
    ------------------------------------
    ------------------------------------
    E6BCA2E6BCA1                         A1
    E6BCA2E6BCA1                         E6BCA1
    
      2 record(s) selected.
    

Local fix

  • Avoid using function with more than one string argument  in the
    definition  OF GENERATED ALWAYS
    column
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description. Install release and fixpak that has   *
    * this fix.                                                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Install release and fixpak that has this fix.                *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT18202

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED FIN

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-12-01

  • Closed date

    2017-05-30

  • Last modified date

    2017-05-30

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

    IT18170

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

Fix information

Applicable component levels

  • R970 PSN

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.7","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
30 May 2017