[pandas-dev#32543] obj.fillna(fill_value) doesn't shallow copy if obj is an empty Series

Author: SaturnFromTitan

pandas/core/generic.py

@@ -6081,9 +6081,6 @@ def fillna(
                 downcast=downcast,
             )
         else:
-            if len(self._get_axis(axis)) == 0:
-                return self
-
             if self.ndim == 1:
                 if isinstance(value, (dict, ABCSeries)):
                     value = create_series_with_explicit_dtype(

pandas/tests/base/test_ops.py

@@ -611,9 +611,6 @@ def test_fillna(self, index_or_series_obj):
             tm.assert_series_equal(obj, result)
 
         # check shallow_copied
-        if isinstance(obj, Series) and len(obj) == 0:
-            # TODO: GH-32543
-            pytest.xfail("Shallow copy for empty Series is bugged")
         assert obj is not result
 
     @pytest.mark.parametrize("null_obj", [np.nan, None])