Fixed asarray

Author: TomAugspurger

pandas/core/internals/managers.py

@@ -791,6 +791,11 @@ def _interleave(self):
         """
         dtype = _interleaved_dtype(self.blocks)
 
+        if is_extension_array_dtype(dtype):
+            # TODO: https://github.com/pandas-dev/pandas/issues/22791
+            # Give EAs some input on what happens here. Sparse needs this.
+            dtype = 'object'
+
         result = np.empty(self.shape, dtype=dtype)
 
         if result.shape[0] == 0:

pandas/tests/frame/test_dtypes.py

@@ -843,7 +843,8 @@ def test_asarray_homogenous(self):
         df = pd.DataFrame({"A": pd.Categorical([1, 2]),
                            "B": pd.Categorical([1, 2])})
         result = np.asarray(df)
-        expected = np.array([[1, 1], [2, 2,]])
+        # may change from object in the future
+        expected = np.array([[1, 1], [2, 2,]], dtype='object')
         tm.assert_numpy_array_equal(result, expected)