Table function sensitive to where clause?

Question

Hi-
In Oracle SQL, you can use the results of a PL/SQL function as a table with the "TABLE()" syntax. Example: "SELECT * FROM TABLE(myfunction(param1,param2)) ..."
Is there any (non-crazy) way for the function to be aware of the conditions in the WHERE clause of that SELECT statement? For example, if I wanted "myfunction" to know that I had specified "WHERE param3=10' without having to put param3 in the function call, could this be done?
Other SQL implementations support this. I know of at least one where you can map a table on top of a function where the "in" parameters can correspond to columns on the mapped table. Does Oracle support a similar syntax or strategy?

Answer 1

Not sure if it is too crazy for you ;)
But again I rely on a helper function since I am not sure about the purpose of the whole thing:
SQL> create or replace function set_param (p varchar2) return varchar2
as
begin
  dbms_application_info.set_client_info(p);
return p;
end set_param;
Function created.
SQL> create or replace function myfunction
   return sys.dbms_debug_vc2coll
as
begin
   return sys.dbms_debug_vc2coll (sys_context ('userenv', 'client_info'));
end myfunction;
Function created.
SQL> select   *
  from   table (myfunction())
where   set_param (3) is not null
COLUMN_VALUE                                                                   
3                     Hope you get the idea ....