BUG: attempt initial fix

pandas/core/indexes/base.py

@@ -4441,9 +4441,15 @@ def sort_values(
  """
  idx = ensure_key_mapped(self, key)
 
- _as = idx.argsort()
+ # GH 35584. Place missing values at the end of sorted Index,
+ # same as Series.sort_values
+ bad = isna(idx)
+ good = ~bad
+ _as = np.arange(len(idx), dtype=np.int64)
+ _as = np.concatenate([_as[good][idx[good].argsort()], _as[bad]])
+
  if not ascending:
- _as = _as[::-1]
+ _as[:np.sum(good)] = _as[:np.sum(good)][::-1]
 
  sorted_index = self.take(_as)
 

pandas/core/resample.py

@@ -287,6 +287,7 @@ def aggregate(self, func, *args, **kwargs):
  self._set_binner()
  result, how = self._aggregate(func, *args, **kwargs)
  if result is None:
+ print("Here")
  how = func
  grouper = None
  result = self._groupby_and_aggregate(how, grouper, *args, **kwargs)