Per SQL spec (in particular, the grammar in SQL:2008 7.13) we should allow

parentheses around the <query expression body> that follows a WITH clause, eg
	with cte(foo) as ( values(0) ) ((select foo from cte));
This seems to be just an oversight/thinko in gram.y.  Noted while
experimenting with bug #4902.

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 280443074f5de72d1b2ad80bc81729b36ca27448..06499fa9bc928195e62736c07f18d09a84def965 100644 (file)
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.665 2009/06/18 01:27:02 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.666 2009/07/06 02:58:40 tgl Exp $
  *
  * HISTORY
  *       AUTHOR                        DATE                    MAJOR EVENT
@@ -6879,7 +6879,7 @@ select_no_parens:
                                                                                NULL);
                                        $$ = $1;
                                }
-                       | with_clause simple_select
+                       | with_clause select_clause
                                {
                                        insertSelectOptions((SelectStmt *) $2, NULL, NIL,
                                                                                NULL, NULL,