Fix __hash__

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

sdk/python/feast/field.py

@@ -46,9 +46,9 @@ def __eq__(self, other):
         if self.name != other.name or self.dtype != other.dtype:
             return False
         return True
-    
+
     def __hash__(self):
-        return hash((id(self), self.name))
+        return hash((self.name, hash(self.dtype)))
 
     def __lt__(self, other):
         return self.name < other.name
@@ -72,7 +72,7 @@ def from_proto(cls, field_proto: FieldProto):
             field_proto: FieldProto protobuf object
         """
         return cls(name=field_proto.name, dtype=from_value_type(field_proto.value_type))
-    
+
     @classmethod
     def from_feature(cls, feature: Feature):
         """

sdk/python/feast/types.py

@@ -46,6 +46,9 @@ def to_value_type(self) -> ValueTypeProto.Enum:
         """
         raise NotImplementedError
 
+    def __hash__(self):
+        return hash(self.to_value_type())
+
     def __eq__(self, other):
         return self.to_value_type() == other.to_value_type()