order_by.result, order_by.test:

  Added a test case for bug #7672.
sql_yacc.yy:
  Fixed bug #7672.
  Made queries of the form (SELECT ...) ORDER BY ... to
  be equivalent to SELECT ... ORDER BY ...

mysql-test/r/order_by.result

@@ -554,3 +554,20 @@ explain select id,t from t1 force index (primary) order by id;
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t1	index	NULL	PRIMARY	4	NULL	1000	
 drop table t1;
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (2), (1), (1), (2), (1);
+SELECT a FROM t1 ORDER BY a;
+a
+1
+1
+1
+2
+2
+(SELECT a FROM t1) ORDER BY a;
+a
+1
+1
+1
+2
+2
+DROP TABLE t1;

mysql-test/t/order_by.test

@@ -364,3 +364,14 @@ enable_query_log;
 explain select id,t from t1 order by id;
 explain select id,t from t1 force index (primary) order by id;
 drop table t1;
+
+#
+# Bug #7672 - a wrong result for a select query in braces followed by order by
+#
+
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (2), (1), (1), (2), (1);
+SELECT a FROM t1 ORDER BY a;
+(SELECT a FROM t1) ORDER BY a;
+DROP TABLE t1;
+

sql/sql_yacc.yy

@@ -4033,12 +4033,15 @@ optional_order_or_limit:
 	      send_error(&lex->thd->net, ER_SYNTAX_ERROR);
 	      YYABORT;
 	    }
+            if (lex->select != &lex->select_lex)
+            {
 	      if (mysql_new_select(lex))
 	        YYABORT;
 	      mysql_init_select(lex);
 	      lex->select->linkage=NOT_A_SELECT;
 	      lex->select->select_limit=lex->thd->variables.select_limit;
             }
+	  }
 	  opt_order_clause limit_clause
 	;