Change Filter Shallow Copies to Deep Copies

thicket/tests/test_filter_metadata.py

@@ -32,6 +32,9 @@ def filter_one_column(th, columns_values):
             # check if output is a thicket object
             assert isinstance(new_th, Thicket)
 
+            # check filtered Thicket is separate object
+            assert th.graph is not new_th.graph
+
             # metadata table: compare profile hash keys after filter to expected
             metadata_profile = new_th.metadata.index.tolist()
             assert metadata_profile == exp_index

thicket/tests/test_filter_stats.py

@@ -35,6 +35,10 @@ def check_filter_stats(th, columns_values):
             # check if output is a thicket object
             assert isinstance(new_th, Thicket)
 
+            # check filtered Thicket is separate object
+            # We can't check th.graph because of squash in filter_stats
+            assert th.statsframe.graph is not new_th.statsframe.graph
+
             # filtered nodes in aggregated statistics table
             stats_nodes = sorted(
                 new_th.statsframe.dataframe.index.drop_duplicates().tolist()

thicket/thicket.py

@@ -1090,8 +1090,8 @@ def filter_metadata(self, select_function):
         # Get index name
         index_name = self.metadata.index.name
 
-        # create a copy of the thicket object
-        new_thicket = self.copy()
+        # create a deepcopy of the thicket object
+        new_thicket = self.deepcopy()
 
         # filter metadata table
         filtered_rows = new_thicket.metadata.apply(select_function, axis=1)
@@ -1242,8 +1242,8 @@ def filter_stats(self, filter_function):
         Returns:
             (thicket): new thicket object with applied filter function
         """
-        # copy thicket
-        new_thicket = self.copy()
+        # deepcopy thicket
+        new_thicket = self.deepcopy()
 
         # filter aggregated statistics table
         filtered_rows = new_thicket.statsframe.dataframe.apply(filter_function, axis=1)