@@ -127,7 +127,7 @@ def aggregate(self, func):
                             .format(par_col.name))
 
         out = par_col.__class__(data=vals, name=par_col.name, description=par_col.description,
-                           unit=par_col.unit, format=par_col.format, meta=par_col.meta)
+                                unit=par_col.unit, format=par_col.format, meta=par_col.meta)
         return out
 
 
@@ -166,7 +166,14 @@ def aggregate(self, func):
         for col in parent_table.columns.values():
             # For key columns just pick off first in each group since they are identical
             if col.name in self.group_keys:
-                new_col = col.take(i0s)
+                # Should just be new_col = col.take(i0s), but there is a bug in
+                # MaskedColumn finalize:
+                # >>> c = MaskedColumn(data=[1,2], name='a', description='a')
+                # >>> print c[1:2].description
+                # None
+                new_col = col.__class__(data=col.take(i0s), name=col.name,
+                                        description=col.description,
+                                        unit=col.unit, format=col.format, meta=col.meta)
             else:
                 try:
                     new_col = col.groups.aggregate(func)