IT31791: FUNCTIONAL INDEX IS NOT USED BY A SELECT IN A STORED PRECEDURE

APAR status

• Closed as program error.

Error description

• Consider a simple table using a functional index in a definition
  like this
  
  create table "informix".kokos  (a serial not null ,b
  varchar(40));
  
  create function "informix".uppc (a varchar (40)) returning
  varchar (40) with (not variant);
     return upper (a);
  end function;
  create index "informix".kokos_1 on "informix".kokos
  ("informix".uppc(b) ) using btree ;
  
  A simple standalone query like:
  
  select a,b,uppc (b) from kokos where uppc (b) like uppc
  ("Hqs%");
  
  ... will use the index, but the similar query in a stored
  procedure
  
  
  create procedure "informix".jojo1 (p_b varchar (40)) returning
  integer, varchar (40), varchar(40);
     define l_a integer;
     define l_b varchar (40);
     define l_ub varchar (40);
  
     foreach select a,b,uppc(b) into l_a,l_b,l_ub from kokos where
  uppc (b) like uppc (p_b)
        return l_a, l_b,l_ub with resume;
     end foreach
  end procedure;
  execute procedure jojo1 ("Hqs%");
  
  ... will not use the index, but can be forced by a directive.
  And then the statistics show inaccurately that the index is
  used, yet all rows in the table are scanned.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Informix Server prior to 12.10.xC15 and 14.10.xC4.  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Informix Server 12.10.xC15 (when available) or    *
  * 14.10.xC4.                                                   *
  ****************************************************************
  

Problem conclusion

• Fixed in Informix Server 12.10.xC15 and 14.10.xC4.
  

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

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels