reverting deep copy change and using to_dict instead

Author: manu-sj

python/hsfs/core/feature_group_engine.py

@@ -14,7 +14,6 @@
 #
 from __future__ import annotations
 
-import copy
 import warnings
 from typing import List
 
@@ -263,7 +262,7 @@ def sql(self, query, feature_store_name, dataframe_type, online, read_options):
     def _update_features_metadata(self, feature_group: fg.FeatureGroup, features):
         # perform changes on copy in case the update fails, so we don't leave
         # the user object in corrupted state
-        copy_feature_group: fg.FeatureGroup = copy.deepcopy(feature_group)
+        copy_feature_group = fg.FeatureGroup.from_response_json(feature_group.to_dict())
         copy_feature_group.features = features
         self._feature_group_api.update_metadata(
             feature_group, copy_feature_group, "updateMetadata"

python/hsfs/feature_group.py

@@ -3554,7 +3554,9 @@ def to_dict(self) -> Dict[str, Any]:
             "topicName": self.topic_name,
             "notificationTopicName": self.notification_topic_name,
             "deprecated": self.deprecated,
-            "transformationFunctions": self._transformation_functions,
+            "transformationFunctions": [
+                tf.to_dict() for tf in self._transformation_functions
+            ],
         }
         if self._online_config:
             fg_meta_dict["onlineConfig"] = self._online_config.to_dict()

python/hsfs/transformation_function.py

@@ -227,7 +227,7 @@ def to_dict(self) -> Dict[str, Any]:
             "id": self._id,
             "version": self._version,
             "featurestoreId": self._featurestore_id,
-            "hopsworksUdf": self._hopsworks_udf,
+            "hopsworksUdf": self._hopsworks_udf.to_dict(),
         }
 
     def _get_output_column_names(self) -> str: