*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.165 2008/10/04 21:56:54 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.166 2008/10/05 22:20:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/* not a simple relation, leave it unmarked */
break;
case RTE_CTE:
- /* CTE reference: copy up from the subquery */
- if (attnum != InvalidAttrNumber)
+ /*
+ * CTE reference: copy up from the subquery, if possible.
+ * If the RTE is a recursive self-reference then we can't do
+ * anything because we haven't finished analyzing it yet.
+ * However, it's no big loss because we must be down inside
+ * the recursive term of a recursive CTE, and so any markings
+ * on the current targetlist are not going to affect the results
+ * anyway.
+ */
+ if (attnum != InvalidAttrNumber && !rte->self_reference)
{
CommonTableExpr *cte = GetCTEForRTE(pstate, rte);
TargetEntry *ste;
*/
break;
case RTE_CTE:
+ /* CTE reference: examine subquery's output expr */
+ if (!rte->self_reference)
{
- /* CTE reference: examine subquery's output expr */
CommonTableExpr *cte = GetCTEForRTE(pstate, rte);
TargetEntry *ste;
WITH RECURSIVE subdepartment AS
(
-- non recursive term
- SELECT * FROM department WHERE name = 'A'
+ SELECT name as root_name, * FROM department WHERE name = 'A'
UNION ALL
-- recursive term
- SELECT d.* FROM department AS d, subdepartment AS sd
+ SELECT sd.root_name, d.* FROM department AS d, subdepartment AS sd
WHERE d.parent_department = sd.id
)
SELECT * FROM subdepartment ORDER BY name;
- id | parent_department | name
-----+-------------------+------
- 1 | 0 | A
- 2 | 1 | B
- 3 | 2 | C
- 4 | 2 | D
- 6 | 4 | F
+ root_name | id | parent_department | name
+-----------+----+-------------------+------
+ A | 1 | 0 | A
+ A | 2 | 1 | B
+ A | 3 | 2 | C
+ A | 4 | 2 | D
+ A | 6 | 4 | F
(5 rows)
-- extract all departments under 'A' with "level" number
WITH RECURSIVE subdepartment AS
(
-- non recursive term
- SELECT * FROM department WHERE name = 'A'
+ SELECT name as root_name, * FROM department WHERE name = 'A'
UNION ALL
-- recursive term
- SELECT d.* FROM department AS d, subdepartment AS sd
+ SELECT sd.root_name, d.* FROM department AS d, subdepartment AS sd
WHERE d.parent_department = sd.id
)
SELECT * FROM subdepartment ORDER BY name;