Fix __getitem__ return for feature view and on-demand feature view (feast-dev#1936)

Signed-off-by: David Y Liu <[email protected]>

Author: mavysavydav

sdk/python/feast/feature_view.py

@@ -181,7 +181,7 @@ def __getitem__(self, item):
         cp = self.__copy__()
         cp.projection.features = referenced_features
 
-        return self
+        return cp
 
     def __eq__(self, other):
         if not isinstance(other, FeatureView):

sdk/python/feast/on_demand_feature_view.py

@@ -87,7 +87,7 @@ def __getitem__(self, item):
         cp = self.__copy__()
         cp.projection.features = referenced_features
 
-        return self
+        return cp
 
     def with_name(self, name: str):
         """