Fixed metadata propagation in Dataframe.apply

Co-authored-by: Mohamad Rkein <[email protected]>
Co-authored-by: Rafael Rodrigues <[email protected]>

Author: moha-rk

doc/source/whatsnew/v1.4.0.rst

@@ -571,6 +571,7 @@ Reshaping
 - Bug in :func:`concat` would fail when the ``objs`` argument all had the same index and the ``keys`` argument contained duplicates (:issue:`43595`)
 - Bug in :func:`concat` which ignored the ``sort`` parameter (:issue:`43375`)
 - Fixed bug in :func:`merge` with :class:`MultiIndex` as column index for the ``on`` argument returning an error when assigning a column internally (:issue:`43734`)
+- Fixed metadata propagation in :class:`Dataframe.apply` method (:issue:`28283`)
 
 Sparse
 ^^^^^^

pandas/core/frame.py

@@ -8866,7 +8866,7 @@ def apply(
             args=args,
             kwargs=kwargs,
         )
-        return op.apply()
+        return op.apply().__finalize__(self, method="apply")
 
     def applymap(
         self, func: PythonFuncType, na_action: str | None = None, **kwargs

pandas/tests/generic/test_finalize.py

@@ -472,7 +472,6 @@
     (pd.Series, ([1],), operator.methodcaller("apply", lambda x: x)),
     pytest.param(
         (pd.DataFrame, frame_mi_data, operator.methodcaller("apply", lambda x: x)),
-        marks=not_implemented_mark,
     ),
     # Cumulative reductions
     (pd.Series, ([1],), operator.methodcaller("cumsum")),