--- a/cubicweb/server/sources/native.py	Wed Jul 20 09:09:34 2016 +0200
+++ b/cubicweb/server/sources/native.py	Wed Jul 20 09:21:51 2016 +0200
@@ -557,7 +557,7 @@
                 self._cache[cachekey] = sql, qargs, cbs
         args = self.merge_args(args, qargs)
         assert isinstance(sql, string_types), repr(sql)
-        cursor = self.doexec(cnx, sql, args)
+        cursor = cnx.system_sql(sql, args)
         results = self.process_result(cursor, cnx, cbs)
         assert dbg_results(results)
         return results