BUG: indexing a DataFrame with MultiIndex through .ix[index, col] wit…

…h unsorted index #2314

pandas/core/indexing.py

@@ -281,7 +281,7 @@ def _getitem_lowerdim(self, tup):
                 # slices are unhashable
                 pass
             except Exception, e1:
-                if isinstance(tup[0], slice):
+                if isinstance(tup[0], (slice, Index)):
                     raise IndexingError
                 try:
                     loc = ax0.get_loc(tup[0])

pandas/tests/test_multilevel.py

@@ -314,6 +314,16 @@ def test_getitem_setitem_tuple_plus_columns(self):
         expected = df.ix[2000, 1, 6][['A', 'B', 'C']]
         assert_series_equal(result, expected)
 
+    def test_getitem_multilevel_index_tuple_unsorted(self):
+        index_columns = list("abc")
+        df = DataFrame([[0, 1, 0, "x"], [0, 0, 1, "y"]] ,
+                       columns=index_columns + ["data"])
+        df = df.set_index(index_columns)
+        query_index = df.index[:1]
+        rs = df.ix[query_index, "data"]
+        xp = Series(['x'], index=MultiIndex.from_tuples([(0, 1, 0)]))
+        assert_series_equal(rs, xp)
+
     def test_xs(self):
         xs = self.frame.xs(('bar', 'two'))
         xs2 = self.frame.ix[('bar', 'two')]