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 ac17b93bf6863115a54496fcdf9bb2a6e7c15a20..20ab0bac2afa791781c91e107ab0154b78678405 100644 (file)
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -6879,7 +6879,7 @@ select_no_parens:
                                                                                NULL);
                                        $$ = $1;
                                }
-                       | with_clause simple_select
+                       | with_clause select_clause
                                {
                                        insertSelectOptions((SelectStmt *) $2, NULL, NIL,
                                                                                NULL, NULL,