items for functions which is converted to constants internally to support its correct printing added (BUG#4663)


mysql-test/r/view.result:
  test of functions in VIEW which is converted to constants internally
mysql-test/t/view.test:
  test of functions in VIEW which is converted to constants internally
sql/item.h:
  items for functions which is converted to constants internally to support its correct printing
sql/item_create.cc:
  items for functions which is converted to constants internally to support its correct printing