Querying the data type of objects in an Array?

Question

I'm able to determine that an argument is an Array using the following query:
SELECT DATA_TYPE
FROM all_arguments
WHERE OBJECT_NAME = 'MY_PROCEDURE' AND ARGUMENT_NAME = 'MY_ARRAY_PARAM'
DATA_TYPE will be 'PL/SQL TABLE' if the argument/parameter is an array.
My question is: Is there a way to query what the type of the objects in the array should be? Like NVARCHAR2, VARCHAR2, RAW, DECIMAL, etc.
Any help is very appreciated!

Answer 1

I guess the part I'm having trouble with is when the
Array is defined in a package because the type
doesn't get listed in "all_coll_types". well, the workaround here would be - the parsing of PACKAGE text - and finding your needed type of array:
SQL> create or replace package TEST_PACK as
  2          TYPE test_type is table of varchar2(100);
  3   end test_pack;
  4  /
Package created
SQL>
SQL> create or replace package body TEST_PACK as
  2    vc_array test_type;
  3    begin
  4     null;
  5    end;
  6  /
Package body created
SQL>
SQL> select * from user_source t
  2   where name = 'TEST_PACK'
  3  /
NAME                           TYPE               LINE TEXT
TEST_PACK                      PACKAGE               1 package TEST_PACK as
TEST_PACK                      PACKAGE               2         TYPE test_type is table of varchar2(100);
TEST_PACK                      PACKAGE               3  end test_pack;
TEST_PACK                      PACKAGE BODY          1 package body TEST_PACK as
TEST_PACK                      PACKAGE BODY          2   vc_array test_type;
TEST_PACK                      PACKAGE BODY          3   begin
TEST_PACK                      PACKAGE BODY          4    null;
TEST_PACK                      PACKAGE BODY          5   end;
8 rows selected
SQL>