Fix for bug#14861 aliased column names are not preserved.

  Create tmp table filed using original item name when it's necessary

mysql-test/r/view.result

@@ -2456,3 +2456,19 @@ f1()
 42
 drop view v2,v1;
 drop function f1;
+create table t1 (id numeric, warehouse_id numeric);
+create view v1 as select id from t1;
+create view v2 as
+select t1.warehouse_id, v1.id as receipt_id
+from t1, v1 where t1.id = v1.id;
+insert into t1 (id, warehouse_id) values(3, 2);
+insert into t1 (id, warehouse_id) values(4, 2);
+insert into t1 (id, warehouse_id) values(5, 1);
+select v2.receipt_id as alias1, v2.receipt_id as alias2 from v2
+order by v2.receipt_id;
+alias1	alias2
+3	3
+4	4
+5	5
+drop view v2, v1;
+drop table t1;

mysql-test/t/view.test

@@ -2319,3 +2319,22 @@ CREATE VIEW v2 AS SELECT f1();
 select * from v2;
 drop view v2,v1;
 drop function f1;
+
+#
+# Bug#14861: aliased column names are not preserved.
+#
+create table t1 (id numeric, warehouse_id numeric);
+create view v1 as select id from t1;
+create view v2 as
+select t1.warehouse_id, v1.id as receipt_id
+from t1, v1 where t1.id = v1.id;
+
+insert into t1 (id, warehouse_id) values(3, 2);
+insert into t1 (id, warehouse_id) values(4, 2);
+insert into t1 (id, warehouse_id) values(5, 1);
+
+select v2.receipt_id as alias1, v2.receipt_id as alias2 from v2
+order by v2.receipt_id;
+
+drop view v2, v1;
+drop table t1;

sql/sql_select.cc

@@ -8189,7 +8189,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
                         uint convert_blob_length)
 {
   Item::Type orig_type= type;
-  Item *orig_item;
+  Item *orig_item= 0;
 
   if (type != Item::FIELD_ITEM &&
       item->real_item()->type() == Item::FIELD_ITEM &&
@@ -8240,7 +8240,9 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
     }
     else
       result= create_tmp_field_from_field(thd, (*from_field= field->field),
-                                       item->name, table,
+                                          orig_item ? orig_item->name :
+                                          item->name,
+                                          table,
                                           modify_item ? field :
                                           NULL,
                                           convert_blob_length);