User Aggregated Function in Discoverer

Question

Hi.
I'm trying to use an "User Aggregated Function" in Discoverer. This function concatenates a varchar field, and I want to use as a max(), min() or count() functions, but Discoverer always write this function in the group block of the query, and the databse generates an error.
This is the user agrgegated function:
CREATE OR REPLACE function DDS_UXXIINV.var_agg (input varchar2) return varchar2
parallel_enable aggregate using agg_t;
The package agg_t is defined as:
create or replace type agg_t as object (
str_agg varchar2(4000),
static function ODCIAggregateInitialize(sctx in out agg_t)
return number,
member function ODCIAggregateIterate (self in out agg_t,
value in varchar2 )
return number,
member function ODCIAggregateTerminate (self in agg_t ,
return_value out varchar2,
flags in number )
return number,
member function ODCIAggregateMerge(self in out agg_t,
ctx2 in agg_t )
return number
create or replace type body agg_t is
static function ODCIAggregateInitialize(sctx in out agg_t)
return number is
begin
sctx := agg_t(null);
return ODCIConst.Success;
end;
member function ODCIAggregateIterate(
self in out agg_t, value in varchar2)
return number is
begin
str_agg := str_agg || value;
return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(self in agg_t,
return_value out varchar2, flags in number) return number is
begin
return_value := str_agg;
return ODCIConst.Success;
end;
member function ODCIAggregateMerge(self in out agg_t,
ctx2 in agg_t) return number is
begin
str_agg := str_agg || ctx2.str_agg;
return ODCIConst.Success;
end;
end;
When I use this functions (as a calculated field) Discoverer generates this statment:
select var_agg(field1), field2 form table group by var_agg(field1), field2;
I want this statement:
select var_agg(field1), field2 form table group by field2;
Sometimes Oracle generates a error messages saying that there's a wrong combinations of joins (translated from spainsh)
Regards
Óscar Blanco

Answer 1

Hi,
Unfortunately, you cannot import user defined group functions into Discoverer, Discoverer does not understand them.
Rod West