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IT15312: QUERIES CONTAINING MULTIPLE OUTER JOIN OPERATIONS AND NESTED EXPRESSIONS MAY PRODUCE INCORRECT RESULTS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Queries containing multiple outer join operation may produce
    incorrect results under certain conditions.
    
    An OUTER JOIN used in a view, common table expression or nested
    sub-select and contains expressions that do not reference the
    input operands of the OUTER JOIN or complex scalar expressions
    such as
    - CASE expressions
    - COALESCE
    - DECODE
    - VALUE
    - or external user defined functions which are not defined as
    'RETURNS NULL ON NULL INPUT'.
    
    When such an view, common table expression, or nested sub-select
    is used as the NULL producing operand of a higher level OUTER
    JOIN then the query may produce incorrect results.
    

Local fix

  • The following registry can be used to avoid the potential wrong
    result:
    db2set -im DB2COMPOPT=NO_OJLINEAR
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 10.1 Fix Pack 6                               *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 10.1 Fix Pack 6
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT15312

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-05-17

  • Closed date

    2017-03-02

  • Last modified date

    2017-03-02

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

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

    IT15313

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RA10 PSN UP

       FIX

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Document Information

Modified date:
02 March 2017