Oracle的一个字符串数据变为多行记录

--把p_string的值动态切分为表的行数据
create or replace type split_rec as object (
       id varchar2(50),
       userId varchar2(32767)
     );
create or replace type split_tbl as table of split_rec;
CREATE OR REPLACE FUNCTION splitstr(id in varchar2,p_string IN VARCHAR2, p_delimiter IN VARCHAR2 := ',')
    RETURN split_tbl PIPELINED
AS
    v_length   NUMBER := LENGTH(p_string);
    v_start    NUMBER := 1;
    v_index    NUMBER;
    v_rec      split_rec;
BEGIN
    v_rec := split_rec(id,'');
    WHILE(v_start <= v_length)
    LOOP
        v_index    := INSTR(p_string, p_delimiter, v_start);
        IF v_index = 0
        THEN
            v_rec.userId:=SUBSTR(p_string, v_start);
            v_start    := v_length + 1;
        ELSE
            v_rec.userId:=SUBSTR(p_string, v_start, v_index - v_start);
            v_start    := v_index + 1;
        END IF;
       
        PIPE ROW(v_rec);
    END LOOP;
    RETURN;
END splitstr;
--以下是测试SQL。
select x.*,u.name
from user u,
  (
    select r.*,x.userId
    from item r
         join table(splitstr(r.id,nvl(r.acol,r.