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lib/Doctrine/Expression.php

@@ -661,4 +661,15 @@ class Doctrine_Expression extends Doctrine_Connection_Module
     {
         throw new Doctrine_Expression_Exception('method not implemented');
     }
+    /**
+     * __call
+     *
+     * for all native RDBMS functions the function name itself is returned
+     */
+    public function __call($m, $a) 
+    {
+    	if ($this->conn->getAttribute(Doctrine::ATTR_PORTABILITY) & Doctrine::PORTABILITY_EXPR) {
+            throw new Doctrine_Expression_Exception('Unknown expression ' . $m);
+        }
+    }
 }

lib/Doctrine/Query.php

@@ -235,9 +235,7 @@ class Doctrine_Query extends Doctrine_Hydrate implements Countable {
         $pos  = strpos($func, '(');
         $name = substr($func, 0, $pos);
 
-
-        if(method_exists($this->conn->expression, $name)) {
-
+        try {
             $argStr = substr($func, ($pos + 1), -1);
             $args   = explode(',', $argStr);
     
@@ -279,8 +277,8 @@ class Doctrine_Query extends Doctrine_Hydrate implements Countable {
             }
     
             $this->pendingAggregates[$owner][] = array($name, $args, $distinct, $alias);
-        } else {
-            throw new Doctrine_Query_Exception('Unknown function '.$name);
+        } catch(Doctrine_Expression_Exception $e) {
+            throw new Doctrine_Query_Exception('Unknown function ' . $func . '.');
         }
     }
     public function processPendingSubqueries()