code: def test_aliased_comparator(self):
      class Comparator(ColumnProperty.Comparator):
          __hash__ = None
  
          def __eq__(self, other):
              return func.foobar(
                  self.__clause_element__()
              ) == func.foobar(other)
  
      Foo = self._fixture()
      Foo._name = Column("name", String)
  
      def comparator_factory(self, mapper):
          prop = mapper._props["_name"]
          return Comparator(prop, mapper)
  
      d = MockDescriptor(
          Foo, "foo", comparator_factory=comparator_factory
      )
      d.instrument_class(Foo.__mapper__)
  
      eq_(str(Foo.foo == "ed"), "foobar(foo.name) = foobar(:foobar_1)")
      eq_(
          str(aliased(Foo).foo == "ed"),
          "foobar(foo_1.name) = foobar(:foobar_1)",
      )
  
imports: from sqlalchemy import Column
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy.orm import aliased
  from sqlalchemy.orm import declarative_base
  from sqlalchemy.orm import descriptor_props
  from sqlalchemy.orm.interfaces import PropComparator
  from sqlalchemy.orm.properties import ColumnProperty
  from sqlalchemy.sql import column
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.util import partial
label_desc: Use image node_id 6 for calling the DescriptorInstrumentationTest obj's underlying member method code with example usage: obj.test_aliased_comparator() and returns: Comparator, unknown