oracle的split函数截取怎么返回成一行数据

oracle的split函数截取怎么返回成一行数据

oracle的split函数截取如何返回成一行数据
CREATE OR REPLACe TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);

CREATE OR REPLACE FUNCTION split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)
RETURN ty_str_split
IS
j INT := 0;
i INT := 1;
len INT := 0;
len1 INT := 0;
str VARCHAR2 (4000);
str_split ty_str_split := ty_str_split ();
BEGIN
len := LENGTH (p_str);
len1 := LENGTH (p_delimiter);

WHILE j < len
LOOP
j := INSTR (p_str, p_delimiter, i);

IF j = 0
THEN
j := len;
str := SUBSTr (p_str, i);
str_split.EXTEND;
str_split (str_split.COUNT) := str;

IF i >= len
THEN
EXIT;
END IF;
ELSE
str := SUBSTr (p_str, i, j - i);
i := j + len1;
str_split.EXTEND;
str_split (str_split.COUNT) := str;
END IF;
END LOOP;

RETURN str_split;
END split;
/

1.测试例子：

select * from table (split('a,b,c,sdf',','));

1 a
2 b
3 c
4 sdf
用这个函数进行截取的时候 返回的是多条 如何才能让他返回成一行呢?
a b c sdf