are done for the = operator, such as when doing a comparison with a large
unsigned number that was quoted. (Bug #12612)


mysql-test/r/func_equal.result:
  Add new results
mysql-test/t/func_equal.test:
  Add new test
sql/item_cmpfunc.cc:
  Handle FIELD_ITEM that can be compared as a longlong in agg_cmp_type()
  instead of in each of the places it is called.