/** * @param Mana_Db_Model_Formula_Context $context * @param Mana_Db_Model_Formula_Node_Field $formula * @param Mana_Db_Model_Formula_Expr $expr */ public function selectField($context, $formula, $expr) { $expr->setIsAggregate(true)->setSubSelect($context->getAggregateContext()->getSelect()); }