bad old merge fixed

mysql-test/r/order_by.result:
  buggy results bug#3681
mysql-test/t/order_by.test:
  test for bug#3681

mysql-test/r/order_by.result

@@ -85,6 +85,15 @@ i
 1
 3
 drop table t1;
+create table t1 ( pk     int primary key, name   varchar(255) not null, number varchar(255) not null);
+insert into t1 values (1, 'Gamma',     '123'), (2, 'Gamma Ext', '123a'), (3, 'Alpha',     '001'), (4, 'Beta',      '200c');
+select distinct t1.name as 'Building Name',t1.number as 'Building Number' from t1 order by t1.name asc;
+Building Name	Building Number
+Gamma	123
+Gamma Ext	123a
+Alpha	001
+Beta	200c
+drop table t1;
 create table t1 (id int not null,col1 int not null,col2 int not null,index(col1));
 insert into t1 values(1,2,2),(2,2,1),(3,1,2),(4,1,1),(5,1,4),(6,2,3),(7,3,1),(8,2,4);
 select * from t1 order by col1,col2;

mysql-test/t/order_by.test

@@ -79,6 +79,16 @@ select distinct i from t1 order by 1-i;
 select distinct i from t1 order by mod(i,2),i;
 drop table t1;
 
+#
+# bug#3681
+#
+
+create table t1 ( pk     int primary key, name   varchar(255) not null, number varchar(255) not null);
+insert into t1 values (1, 'Gamma',     '123'), (2, 'Gamma Ext', '123a'), (3, 'Alpha',     '001'), (4, 'Beta',      '200c');
+select distinct t1.name as 'Building Name',t1.number as 'Building Number' from t1 order by t1.name asc;
+drop table t1;
+
+
 #
 # Order by on first index part
 #

sql/sql_select.cc

@@ -665,7 +665,6 @@ JOIN::optimize()
     if (!order && org_order)
       skip_sort_order= 1;
   }
-  order= remove_const(this, order, conds, &simple_order);
   if (group_list || tmp_table_param.sum_func_count)
   {
     if (! hidden_group_fields)