Code update - swap group_index.take with grouper

Author: WillAyd

pandas/core/groupby.py

@@ -4649,8 +4649,7 @@ def _fill(self, direction, limit=None):
         """Overriden method to join grouped columns in output"""
         res = super(DataFrameGroupBy, self)._fill(direction, limit=limit)
         output = collections.OrderedDict(
-            (grp.name, grp.group_index.take(grp.labels)) for grp in
-            self.grouper.groupings)
+            (grp.name, grp.grouper) for grp in self.grouper.groupings)
 
         from pandas.core.reshape.concat import concat
         return concat((self._wrap_transformed_output(output), res), axis=1)