Patch appled after doing a pull from the team tree. Additional tests had to be
fixed


mysql-test/r/union.result:
  Bug 24791
  
  The tests for temporary tables have been fixed. Since the call to 
  display_length(Item) was removed from the constructor for Item_type_holder, items 
  in temporary tables keep the original values of the items, rather than the magic
  numbers supplied by display_length.