CI: Fix tests broken by np 1.18 sorting change (pandas-dev#29877)

proost · Dec 19, 2019 · 3840874 · 3840874
1 parent 2d7fe7b
commit 3840874
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/pandas/core/indexes/datetimelike.py b/pandas/core/indexes/datetimelike.py
@@ -284,7 +284,10 @@ def sort_values(self, return_indexer=False, ascending=True):
             sorted_index = self.take(_as)
             return sorted_index, _as
         else:
-            sorted_values = np.sort(self._ndarray_values)
+            # NB: using asi8 instead of _ndarray_values matters in numpy 1.18
+            #  because the treatment of NaT has been changed to put NaT last
+            #  instead of first.
+            sorted_values = np.sort(self.asi8)
             attribs = self._get_attributes_dict()
             freq = attribs["freq"]