Common table expression defining a function in a cursor - sql

Question

Does somebody know if it is possible to use the a common table expression that defines a local function inside a PL/SQL cursor?
For example this code produce an error for me:
DECLARE
CURSOR LV_CUR IS
WITH function fct2(x number) return number is
begin
return 2*x;
end;
TEMP_AV AS
(
SELECT
fct2(LEVEL)
FROM
DUAL
CONNECT BY LEVEL < 10
)
SELECT
*
FROM
TEMP_AV;
BEGIN
FOR I IN LV_CUR
LOOP
NULL;
dbms_output.put_line(i.level);
END LOOP;
END;
The error is :
ORA-06550: Ligne 3, colonne 18 :
PL/SQL: ORA-00905: mot-clé absent
ORA-06550: Ligne 3, colonne 3 :
PL/SQL: SQL Statement ignored
ORA-06550: Ligne 6, colonne 5 :
PLS-00103: Encountered the symbol "END" when expecting one of the following:
begin function pragma procedure subtype type
current cursor delete
exists prior
I am able to execute the query (with the common table expression including a function definition) outside PL/SQL.

Answer 1

Yes and no. The 12.1 docs for the CURSOR statement explicitly say:
Restriction on select_statement
This select_statement cannot have a WITH clause.
This docs are wrong in this case, since you can have a WITH clause, it apparently just can't have the new 12c PL/SQL declarations in it. This block works fine, for example.
DECLARE
CURSOR LV_CUR IS
WITH
TEMP_AV AS
(
SELECT
level
FROM
DUAL
CONNECT BY LEVEL < 10
)
SELECT
*
FROM
TEMP_AV;
BEGIN
FOR I IN LV_CUR
LOOP
NULL;
dbms_output.put_line(i.level);
END LOOP;
END;
/