Two bug fixes

mysql-test/r/innodb.result

@@ -1207,6 +1207,16 @@ SET AUTOCOMMIT=0;
 INSERT INTO t1 ( B_ID ) VALUES ( 1 );
 INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
 ROLLBACK;
+Warning:  Some non-transactional changed tables couldn't be rolled back
 SELECT * FROM t1;
 B_ID
 drop table  t1,t2;
+create table t1  ( pk         int primary key,    parent     int not null,    child      int not null,       index (parent)  ) type = innodb;
+insert into t1 values   (1,0,4),  (2,1,3),  (3,2,1),  (4,1,2);
+select distinct  parent,child   from t1   order by parent;
+parent	child
+0	4
+1	2
+1	3
+2	1
+drop table t1;

mysql-test/t/innodb.test

@@ -802,6 +802,11 @@ CREATE TABLE t1 (  B_ID           INTEGER NOT NULL PRIMARY KEY) TYPE=InnoDB;
 SET AUTOCOMMIT=0;
 INSERT INTO t1 ( B_ID ) VALUES ( 1 );
 INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
+-- error 1196
 ROLLBACK;
 SELECT * FROM t1;
 drop table  t1,t2;
+create table t1  ( pk         int primary key,    parent     int not null,    child      int not null,       index (parent)  ) type = innodb;
+insert into t1 values   (1,0,4),  (2,1,3),  (3,2,1),  (4,1,2);
+select distinct  parent,child   from t1   order by parent;
+drop table t1;

sql/sql_select.cc

@@ -555,6 +555,8 @@ mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &fields,COND *conds,
 	/*  Change DISTINCT to GROUP BY */
 	select_distinct= 0;
 	no_order= !order;
+	if (order && skip_sort_order)
+	  join.tmp_table_param.quick_group=0;
 	if (all_order_fields_used)
 	  order=0;
 	join.group=1;				// For end_write_group

sql/sql_update.cc

@@ -478,7 +478,14 @@ int multi_update::prepare(List<Item> &not_used_values)
       table->used_keys=0;
       table->pos_in_table_list= tl;
     }
+    else
+    {
+      table_ref->lock_type=TL_READ;
+      mysql_unlock_some_tables(thd,&table,1);
+    }
   }
+
+
   table_count=  update.elements;
   update_tables= (TABLE_LIST*) update.first;