Raise NotImplementedError for Series.rename that's not a scalar (#16525)

xref #16507

Raising a `NotImplementedError` gives a chance for this work in `cudf.pandas`

Authors:
  - Matthew Roeschke (https://github.com/mroeschke)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

URL: #16525

python/cudf/cudf/core/series.py

@@ -3589,6 +3589,10 @@ def rename(
             raise NotImplementedError("level is currently not supported.")
         if errors != "ignore":
             raise NotImplementedError("errors is currently not supported.")
+        if not is_scalar(index):
+            raise NotImplementedError(
+                ".rename does not currently support relabeling the index."
+            )
         out_data = self._data.copy(deep=copy)
         return Series._from_data(out_data, self.index, name=index)
 

python/cudf/cudf/tests/test_series.py

@@ -2289,6 +2289,13 @@ def test_series_rename(initial_name, name):
     assert_eq(actual, expected)
 
 
+@pytest.mark.parametrize("index", [lambda x: x * 2, {1: 2}])
+def test_rename_index_not_supported(index):
+    ser = cudf.Series(range(2))
+    with pytest.raises(NotImplementedError):
+        ser.rename(index=index)
+
+
 @pytest.mark.parametrize(
     "data",
     [