519 

   519 

   520     @cached

   520     @cached

   521     def _rset_structure(self, eschema, entity_col):

   521     def _rset_structure(self, eschema, entity_col):

   522         eid_col = col = entity_col

   522         eid_col = col = entity_col

   523         rqlst = self.syntax_tree()

   523         rqlst = self.syntax_tree()

   524         attr_cols = {}

   525         attr_cols = {}

   525         rel_cols = {}

   526         rel_cols = {}

   526         if rqlst.TYPE == 'select':

   527         if rqlst.TYPE == 'select':

   527             # UNION query, find the subquery from which this entity has been

   528             # UNION query, find the subquery from which this entity has been

   528             # found

   529             # found

   530         else:

   531         else:

   531             select = rqlst

   532             select = rqlst

   532         # take care, due to outer join support, we may find None

   533         # take care, due to outer join support, we may find None

   533         # values for non final relation

   534         # values for non final relation

   534         for i, attr, role in attr_desc_iterator(select, col, entity_col):

   535         for i, attr, role in attr_desc_iterator(select, col, entity_col):

   539             if rschema.final:

   537             if rschema.final:

   540                 if attr == 'eid':

   538                 if attr == 'eid':

   541                     eid_col = i

   539                     eid_col = i

   542                 else:

   540                 else:

   543                     attr_cols[attr] = i

   541                     attr_cols[attr] = i