Oracle Type

create or replace type TYPETEST as object(
       abc        varchar2(20)
);

create or replace type typetest1 is table of TYPETEST;

create or replace function fnTestType return typetest1
is
Result typetest1 := typetest1();
begin
  Result := typetest1();
  Result.extend;
  Result(Result.count) := TYPETEST(NULL);
  Result(Result.count).abc := '1';
   
  Result.extend;
  Result(Result.count) := TYPETEST(NULL);
  Result(Result.count).abc := '2';
   
  return(Result);
end fnTestType;

select * from table(cast(fnTestType as typetest1));

drop function fnTestType;
drop type typetest1;
drop type TYPETEST;