FIX-#7578: Change groupby extension allow list and fix cached_property extensions

modin/pandas/api/extensions/extensions.py

@@ -13,6 +13,7 @@
 
 import inspect
 from collections import defaultdict
+from functools import cached_property
 from types import MethodType, ModuleType
 from typing import Any, Dict, Optional, Union
 
@@ -94,6 +95,10 @@ def decorator(new_attr: Any):
             original_attr = getattr(pd, name)
             _reexport_classes[name] = original_attr
             delattr(pd, name)
+        # If the attribute is an instance of functools.cached_property, we must manually call __set_name__ on it.
+        # https://stackoverflow.com/a/62161136
+        if isinstance(new_attr, cached_property):
+            new_attr.__set_name__(obj, name)
         extensions[None if backend is None else Backend.normalize(backend)][
             name
         ] = new_attr

modin/pandas/groupby.py

@@ -91,17 +91,28 @@
     "_wrap_aggregation",
 }
 
+GROUPBY_EXTENSION_NO_LOOKUP = EXTENSION_NO_LOOKUP | {
+    "_axis",
+    "_idx_name",
+    "_df",
+    "_query_compiler",
+    "_columns",
+    "_by",
+    "_drop",
+    "_return_tuple_when_iterating",
+    "_is_multi_by",
+    "_level",
+    "_kwargs",
+    "_get_query_compiler",
+}
+
 
 @_inherit_docstrings(pandas.core.groupby.DataFrameGroupBy)
 class DataFrameGroupBy(ClassLogger, QueryCompilerCaster):  # noqa: GL08
     _pandas_class = pandas.core.groupby.DataFrameGroupBy
     _return_tuple_when_iterating = False
     _df: Union[DataFrame, Series]
     _query_compiler: BaseQueryCompiler
-    # TODO(https://github.com/modin-project/modin/issues/7543):
-    # Currently this _extensions dict doesn't do anything, but we should
-    # add methods to register groupby accessors and make the groupby classes
-    # use this _extensions dict.
     _extensions: EXTENSION_DICT_TYPE = EXTENSION_DICT_TYPE(dict)
 
     def __init__(
@@ -248,7 +259,7 @@ def __getattr__(self, key):
         try:
             return self._getattr__from_extension_impl(
                 key=key,
-                default_behavior_attributes=_DEFAULT_BEHAVIOUR,
+                default_behavior_attributes=GROUPBY_EXTENSION_NO_LOOKUP,
                 extensions=__class__._extensions,
             )
         except AttributeError as err:
@@ -275,7 +286,7 @@ def __getattribute__(self, item: str) -> Any:
         Any
             The value of the attribute.
         """
-        if item not in _DEFAULT_BEHAVIOUR:
+        if item not in GROUPBY_EXTENSION_NO_LOOKUP:
             extensions_result = self._getattribute__from_extension_impl(
                 item, __class__._extensions
             )
@@ -1863,11 +1874,6 @@ def groupby_on_multiple_columns(df, *args, **kwargs):
 @_inherit_docstrings(pandas.core.groupby.SeriesGroupBy)
 class SeriesGroupBy(DataFrameGroupBy):  # noqa: GL08
     _pandas_class = pandas.core.groupby.SeriesGroupBy
-
-    # TODO(https://github.com/modin-project/modin/issues/7543):
-    # Currently this _extensions dict doesn't do anything, but we should
-    # add methods to register groupby accessors and make the groupby classes
-    # use this _extensions dict.
     _extensions: EXTENSION_DICT_TYPE = EXTENSION_DICT_TYPE(dict)
 
     @disable_logging
@@ -1888,7 +1894,7 @@ def __getattribute__(self, item: str) -> Any:
         Any
             The value of the attribute.
         """
-        if item not in _DEFAULT_BEHAVIOUR:
+        if item not in GROUPBY_EXTENSION_NO_LOOKUP:
             extensions_result = self._getattribute__from_extension_impl(
                 item, __class__._extensions
             )
@@ -1901,7 +1907,7 @@ def __getattribute__(self, item: str) -> Any:
     def __getattr__(self, key: str) -> Any:
         return self._getattr__from_extension_impl(
             key=key,
-            default_behavior_attributes=_DEFAULT_BEHAVIOUR,
+            default_behavior_attributes=GROUPBY_EXTENSION_NO_LOOKUP,
             extensions=__class__._extensions,
         )
 

modin/tests/pandas/extensions/test_groupby_extensions.py

@@ -11,6 +11,8 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
+from functools import cached_property
+
 import pytest
 
 import modin.pandas as pd
@@ -241,6 +243,16 @@ def del_property(self):
         delattr(pandas_groupby, public_property_name)
         assert not hasattr(pandas_groupby, private_property_name)
 
+    @pytest.mark.filterwarnings(default_to_pandas_ignore_string)
+    def test_override_cached_property(self, get_groupby, register_accessor):
+        @cached_property
+        def groups(self):
+            return {"group": pd.Index(["test"])}
+
+        register_accessor("groups", backend="Pandas")(groups)
+        pandas_df = pd.DataFrame({"col0": [1], "col1": [2]}).move_to("pandas")
+        assert get_groupby(pandas_df).groups == {"group": pd.Index(["test"])}
+
 
 def test_deleting_extension_that_is_not_property_raises_attribute_error():
     expected_string_val = "Some string value"