Overloaded Function to Convert a Column to Comma-Separated String

Dear Gurus,

I wanted to create a function to convert a column to comma-separated string:

CREATE OR REPLACE TYPE VARCHAR2_TBL AS TABLE OF VARCHAR2(100);
/

CREATE OR REPLACE FUNCTION TABLE_TO_STRING (
                    NT_IN        IN VARCHAR2_TBL,
                    DSTCT IN CHAR DEFAULT 'N',
                    DELIMITER_IN IN VARCHAR2 DEFAULT ', '
                    ) RETURN VARCHAR2 IS

       V_IDX PLS_INTEGER;
       V_STR VARCHAR2(32767);
       --V_ARR_SORT VARCHAR2_TBL;  /* Sort input into this array */

   BEGIN
         /* SORTING ... */
            FOR V_IDX IN NT_IN.FIRST..NT_IN.LAST
            LOOP
               IF v_idx = 1 then
                  V_STR := NT_IN(V_IDX);
               else
                  V_STR := V_STR || DELIMITER_IN || NT_IN(V_IDX);