Index: trunk/core/kernel/db/dblist.php
===================================================================
diff -u -r6093 -r6428
--- trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 6093)
+++ trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 6428)
@@ -436,7 +436,7 @@
 		$fields = $this->getCalculatedFields($aggregated);
 		if (is_array($fields) && count($fields) > 0) {
 			foreach ($fields as $field_name => $field_expression) {
-				$clause = preg_replace('/[,` ]{1}'.$field_name.'[` ]{1}/', $field_expression, $clause);
+				$clause = preg_replace('/[,` ]{1}'.$field_name.'[` ]{1}/', ' '.$field_expression.' ', $clause);
 			}
 		}
 		return $clause;