Join array of numbers with table in function - arrays

Question

I need some support with array type, because it is a new thing for me, so
I have a function:
create or replace type num_array as table of number;
create or replace function functionname(arr_in num_array)
return num_array is
tab num_array;
begin
select id_acc bulk collect into tab from (
SELECT a.id_acc
FROM (SELECT id_acc, parent_acc FROM account) a
connect by nocycle prior a.id_acc=a.parent_acc
start with id_acc in
(
select distinct ID_ACC
from (SELECT id_acc, parent_acc FROM account
) a
where parent_acc = id_acc
connect by nocycle prior a.parent_acc = a.id_acc or parent_acc is null
start with id_acc in (select parent_acc from table_name t,account a where t.id=a.id_acc)));
return tab;
end;
As an input I want to have an array of numbers (id). I want to connect that number (from input) with account table. It is in line:
start with id_acc in (select parent_acc from table_name t,account a where t.id=a.id_acc)));
I would like to join somehow table account with numbers from input,
I was trying to use table(tab()),account a but I got an error.
As output I would like to have result of select query so (return tab).

Answer 1

I'm not sure I understood what you want to achieve. Just to help you with the syntax, look at this:
start with id_acc in (select * from table(arr_in));

Answer 2

Below i have provided a small snippet which basically illustrates your issue with joining Nested Table type with Table.
CREATE OR REPLACE FUNCTION test_ntt_join
RETURN NUMBER_NTT
AS
lv_tab_num NUMBER_NTT;
lv_tab2 NUMBER_NTT;
BEGIN
SELECT LEVEL BULK COLLECT INTO lv_tab_num FROM DUAL CONNECT BY LEVEL < 10;
SELECT COLUMN_VALUE
BULK COLLECT INTO
lv_tab2
FROM TABLE(lv_tab_num) t,
EMP
WHERE emp.empno= t.column_value;
RETURN lv_tab2;
END;
------------------------------------------OUTPUT------------------------------------
select * from table(test_ntt_join);
COLUMN_VALUE
1
1
3
------------------------------------------OUTPUT------------------------------------