--- a/server/sources/rql2sql.py	Mon Apr 15 13:18:01 2013 +0200
+++ b/server/sources/rql2sql.py	Fri Apr 19 15:41:56 2013 +0200
@@ -1513,8 +1513,6 @@
             if rel is not None:
                 rel._q_needcast = value
             return self.keyword_map[value]()
-        if constant.type == 'Boolean':
-            return str(self.dbhelper.boolean_value(value))
         if constant.type == 'Substitute':
             try:
                 # we may found constant from simplified var in varmap