# HG changeset patch
# User Aurelien Campeas <aurelien.campeas@logilab.fr>
# Date 1256116918 -7200
# Node ID 9e5dc4b1ada4609d6d4ec0be4a0eb5044d06c0b0
# Parent  769dc0107f31073e1f81bd35e3a6ba51d0ef9b2d
work around a pb. with subquery_selection_index

diff -r 769dc0107f31 -r 9e5dc4b1ada4 rset.py
--- a/rset.py	Wed Oct 21 11:19:54 2009 +0200
+++ b/rset.py	Wed Oct 21 11:21:58 2009 +0200
@@ -505,6 +505,9 @@
         # UNION query, find the subquery from which this entity has been found
         select = rqlst.locate_subquery(locate_query_col, etype, self.args)[0]
         col = rqlst.subquery_selection_index(select, col)
+        if col is None:
+            # XXX unexpected, should fix subquery_selection_index ?
+            return None, None
         try:
             myvar = select.selection[col].variable
         except AttributeError: