REGR: DataFrame.reset_index with empty RangeIndex (#45377)

Author: jbrockmendel

pandas/core/indexes/base.py

@@ -2083,8 +2083,14 @@ def _drop_level_numbers(self, levnums: list[int]):
 
             if len(lev) == 0:
                 # If lev is empty, lev.take will fail GH#42055
-                res_values = algos.take(lev._values, new_codes[0], allow_fill=True)
-                result = type(lev)._simple_new(res_values, name=new_names[0])
+                if len(new_codes[0]) == 0:
+                    # GH#45230 preserve RangeIndex here
+                    #  see test_reset_index_empty_rangeindex
+                    result = lev[:0]
+                else:
+                    res_values = algos.take(lev._values, new_codes[0], allow_fill=True)
+                    # _constructor instead of type(lev) for RangeIndex compat GH#35230
+                    result = lev._constructor._simple_new(res_values, name=new_names[0])
             else:
                 # set nan if needed
                 mask = new_codes[0] == -1

pandas/tests/frame/methods/test_reset_index.py

@@ -28,6 +28,17 @@
 
 
 class TestResetIndex:
+    def test_reset_index_empty_rangeindex(self):
+        # GH#45230
+        df = DataFrame(
+            columns=["brand"], dtype=np.int64, index=RangeIndex(0, 0, 1, name="foo")
+        )
+
+        df2 = df.set_index([df.index, "brand"])
+
+        result = df2.reset_index([1], drop=True)
+        tm.assert_frame_equal(result, df[[]], check_index_type=True)
+
     def test_set_reset(self):
 
         idx = Index([2 ** 63, 2 ** 63 + 5, 2 ** 63 + 10], name="foo")