1110     def build_description(self, rqlst, args, result):

  1111         """build a description for a given result"""

  1112         if len(rqlst.children) == 1 and len(rqlst.children[0].solutions) == 1:

  1113             # easy, all lines are identical

  1114             selected = rqlst.children[0].selection

  1115             solution = rqlst.children[0].solutions[0]

  1116             description = _make_description(selected, args, solution)

  1117             return RepeatList(len(result), tuple(description))

  1118         # hard, delegate the work :o)

  1119         return self.manual_build_descr(rqlst, args, result)

  1120 

  1121     def manual_build_descr(self, rqlst, args, result):

  1122         """build a description for a given result by analysing each row

  1123 

  1124         XXX could probably be done more efficiently during execution of query

  1125         """

  1126         # not so easy, looks for variable which changes from one solution

  1127         # to another

  1128         unstables = rqlst.get_variable_indices()

  1129         basedescr = []

  1130         todetermine = []

  1131         for i in xrange(len(rqlst.children[0].selection)):

  1132             ttype = selection_idx_type(i, rqlst, args)

  1133             if ttype is None or ttype == 'Any':

  1134                 ttype = None

  1135                 isfinal = True

  1136             else:

  1137                 isfinal = ttype in BASE_TYPES

  1138             if ttype is None or i in unstables:

  1139                 basedescr.append(None)

  1140                 todetermine.append( (i, isfinal) )

  1141             else:

  1142                 basedescr.append(ttype)

  1143         if not todetermine:

  1144             return RepeatList(len(result), tuple(basedescr))

  1145         return self._build_descr(result, basedescr, todetermine)

  1146 

  1147     def _build_descr(self, result, basedescription, todetermine):

  1148         description = []

  1149         etype_from_eid = self.describe

  1150         todel = []

  1151         for i, row in enumerate(result):

  1152             row_descr = basedescription[:]

  1153             for index, isfinal in todetermine:

  1154                 value = row[index]

  1155                 if value is None:

  1156                     # None value inserted by an outer join, no type

  1157                     row_descr[index] = None

  1158                     continue

  1159                 if isfinal:

  1160                     row_descr[index] = etype_from_pyobj(value)

  1161                 else:

  1162                     try:

  1163                         row_descr[index] = etype_from_eid(value)[0]

  1164                     except UnknownEid:

  1165                         self.error('wrong eid %s in repository, you should '

  1166                                    'db-check the database' % value)

  1167                         todel.append(i)

  1168                         break

  1169             else:

  1170                 description.append(tuple(row_descr))

  1171         for i in reversed(todel):

  1172             del result[i]

  1173         return description

  1174