IBM Support

IT26685: DB2 MAY RETURN SQL0901N WHEN EXECUTING A QUERY INVOLVING VARCHARCODEUNITS32 IMPLICIT CASTING AND COLUMNAR TABLES

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APAR status

  • Closed as program error.

Error description

  • DB2 may produce -901 error with  "unexpected error at
    MinMaxPartialEvaluator.cpp:98" when the following conditions are
    satisfied:
    1. Default string units are CODEUNITS32.
    2. The query implicitly casts non-string values (e.g. numerical,
    datetime, boolean) to VARCHAR.
    3. The query contains columnar tables.
    4. There exists a MIN or MAX aggregate function over the
    implicit cast.
    
    For example:
        UPDATE DB CFG FOR TESTDB USING STRING_UNITS CODEUNITS32;
        CREATE TABLE T( I INT ) ORGANIZE BY COLUMN;
        SELECT MAX( I || '' ) FROM T;
    

Local fix

  • Modify the above query to perform an explicit cast to VARCHAR:
    SELECT MAX( CAST( I AS VARCHAR(20) ) || '' ) FROM T;
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * server side fix                                              *
    ****************************************************************
    

Problem conclusion

  • Problem was fixed in DB2 VERSION 111 fix pack XX
    

Temporary fix

  • see local fix
    

Comments

APAR Information

  • APAR number

    IT26685

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-10-19

  • Closed date

    2021-03-19

  • Last modified date

    2021-03-19

  • 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

[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1"}]

Document Information

Modified date:
20 March 2021