Question

I am able to get a similiar function working in TSQL but I am a relative newbie to PL/SQL, I’m hopeing someone can explain to me why this function declaration will not compile.
t_interval_list_table is a table type of objects t_interval which has a single attribute of varchar2(20). Interval_Get_udf just returns a formatted string of type varchar(2)

create or replace
FUNCTION  fn_ExplodeIntervals (
  startTime IN timestamp,
  endTime IN timestamp,
  inputInterval IN int)
  RETURN t_interval_list_table   AS  intervalList t_interval_list_table := t_interval_list_table()
BEGIN

 with SET0 as( select 1 from dual union all select 1 from dual)
   , SET1 as ( select 1 from SET0 s1, SET0 s2)
   , SET2 as ( select 1 from SET1 s1, SET1 s2)
   , SET3 as ( select 1 from SET3 s1, SET3 s2)
   , SET4 as ( select 1 from SET4 s1, SET4 s2)
   , ControlSet AS (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 1 from Dual)) rid  FROM SET4)

  select t_interval(Interval_Get_udf(TO_TIMESTAMP(startTime, 'dd/mm/yyyy') + rid/24 , 1))
  into intervalList
  from ControlSet;

  RETURN intervalList;

END fn_ExplodeIntervals;

Answer 1

You probably can simplify the query in your PL/SQL procedure:

SELECT t_interval(Interval_Get_udf(TRUNC(startTime) + ROWNUM/24 , 1))
BULK COLLECT INTO intervalList
FROM dual 
CONNECT BY LEVEL <= 65536

That might get rid of the error.