The following works invoke it as select * from table(splitter('a,b,c,d'))
create or replace function splitter(p_str in varchar2) return sys.odcivarchar2list
is
v_tab sys.odcivarchar2list:=new sys.odcivarchar2list();
begin
with cte as (select level ind from dual
connect by
level <=regexp_count(p_str,',') +1
)
select regexp_substr(p_str,'[^,]+',1,ind)
bulk collect into v_tab
from cte;
return v_tab;
end;
/