--- a/server/sources/rql2sql.py	Mon Apr 27 10:48:21 2009 +0200
+++ b/server/sources/rql2sql.py	Mon Apr 27 12:11:33 2009 +0200
@@ -952,6 +952,8 @@
             if rel is not None:
                 rel._q_needcast = value
             return self.keyword_map[value]()
+        if constant.type == 'Boolean':
+            value = self.dbms_helper.boolean_value(value)
         if constant.type == 'Substitute':
             _id = constant.value
             if isinstance(_id, unicode):