Fix psql's \dD to show only one row per domain, even when the domain has

multiple check constraints.

src/bin/psql/describe.c

@@ -8,7 +8,7 @@
  *
  * Copyright (c) 2000-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.199 2009/02/11 19:12:04 alvherre Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.200 2009/02/23 15:59:55 tgl Exp $
  */
 #include "postgres_fe.h"
 
@@ -2077,10 +2077,11 @@ listDomains(const char *pattern, bool showSystem)
 					  "            WHEN NOT t.typnotnull AND t.typdefault IS NOT NULL THEN 'default '||t.typdefault\n"
 					  "            ELSE ''\n"
 					  "       END as \"%s\",\n"
-			"       pg_catalog.pg_get_constraintdef(r.oid, true) as \"%s\"\n"
+					  "       pg_catalog.array_to_string(ARRAY(\n"
+					  "         SELECT pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE t.oid = r.contypid\n"
+					  "       ), ' ') as \"%s\"\n"
 					  "FROM pg_catalog.pg_type t\n"
 	   "     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace\n"
-		  "     LEFT JOIN pg_catalog.pg_constraint r ON t.oid = r.contypid\n"
 					  "WHERE t.typtype = 'd'\n",
 					  gettext_noop("Schema"),
 					  gettext_noop("Name"),