Oracle Nested Table predicate in where clause - sql

Question

I have a table that supposed to be searched with multiple columns, which can have multiple values
create table t as select * from all_objects;
create bitmap index IDX_DATA_OBJECT_ID on T (DATA_OBJECT_ID);
create bitmap index IDX_LAST_DDL_TIME on T (LAST_DDL_TIME);
create bitmap index IDX_OBJECT_NAME on T (OBJECT_NAME);
create bitmap index IDX_OBJECT_TYPE on T (OBJECT_TYPE);
create or replace type strarray as table of varchar2(4000)
CREATE OR REPLACE PROCEDURE p_search(op_cursor out SYS_REFCURSOR
,a strarray
,b strarray) IS
ca constant number:= a.count;
cb constant number:= b.count;
BEGIN
OPEN op_cursor FOR
SELECT /*+ gather_plan_statistics asda*/ *
FROM t
WHERE object_name IN (SELECT * FROM TABLE(a))
AND object_type IN (SELECT * FROM TABLE(b));
END;
declare
op_cursor sys_refcursor;
c t%rowtype;
begin
p_search(op_cursor,strarray('ICOL$'),strarray('TABLE'));
loop
fetch op_cursor into c;
exit when op_cursor%notfound;
end loop;
end;
-----------------------------------------------------------------
| Id | Operation | Name |
-----------------------------------------------------------------
| 0 | SELECT STATEMENT | |
|* 1 | HASH JOIN SEMI | |
| 2 | NESTED LOOPS | |
| 3 | NESTED LOOPS | |
| 4 | SORT UNIQUE | |
| 5 | COLLECTION ITERATOR PICKLER FETCH| |
| 6 | BITMAP CONVERSION TO ROWIDS | |
|* 7 | BITMAP INDEX SINGLE VALUE | IDX_OBJECT_NAME |
| 8 | TABLE ACCESS BY INDEX ROWID | T |
| 9 | COLLECTION ITERATOR PICKLER FETCH | |
-----------------------------------------------------------------
It looks fine to me as it does index lookup on more selective column.
But I also have a requirement to search for all values if argument is not passed and I am really stuck with that.
The main question I think is how to write sql to search a table by multiple columns with multiple possible values in these columns? I want to be able to take advantage of bitmap indexes.
Should I maybe stick to Dynamic SQL for such task?
UPDATE.
That is how I currently solved it for the moment.
create context my_ctx using p_search;
CREATE OR REPLACE FUNCTION in_list(p_string IN VARCHAR2) RETURN strarray AS
l_string LONG DEFAULT p_string || ',';
l_data strarray := strarray();
n NUMBER;
BEGIN
LOOP
EXIT WHEN l_string IS NULL;
n := instr(l_string, ',');
l_data.extend;
l_data(l_data.count) := ltrim(rtrim(substr(l_string, 1, n - 1)));
l_string := substr(l_string, n + 1);
END LOOP;
RETURN l_data;
END;
CREATE OR REPLACE PROCEDURE p_search(op_cursor OUT SYS_REFCURSOR
,a VARCHAR2
,b VARCHAR2) IS
l VARCHAR2(4000);
BEGIN
l := 'SELECT /*+ gather_plan_statistics lvv3*/
*
FROM t
WHERE 1=1';
IF a IS NOT NULL
THEN
dbms_session.set_context('MY_CTX', 'OBJ_NAME', a);
l := l || ' and t.object_name in (select /*+ cardinality (objn 5)*/ * from table(cast(in_list(sys_context( ''MY_CTX'',''OBJ_NAME'' )) as strarray)
) objn
)';
END IF;
IF b IS NOT NULL
THEN
dbms_session.set_context('MY_CTX', 'OBJ_TYPE', b);
l := l || ' and t.object_type in (select /*+ cardinality (objt 5)*/ * from table(cast(in_list(sys_context( ''MY_CTX'',''OBJ_TYPE'' )) as strarray)
) objt
)';
END IF;
OPEN op_cursor FOR l;
dbms_session.clear_context('MY_CTX');
END;