the same column as an aliased and as a non-aliased column.

The problem was that Item_direct_view_ref::eq() was first comparing view columns
by name, and in this case the name of one of them is different since it is aliased.


mysql-test/r/select.result:
  Added test for BUG#14662.
mysql-test/t/select.test:
  Added test for BUG#14662.
sql/item.cc:
  Changed the way view column refenreces are compared. Two view columns are
  equal if they resolve to the same result field of a view.