Bitwa na metody?
Mój kod pochodzi z Zend_Db_Table_Abstract, a Twój z Zend_Db_Statement, czego sweter na 99% nie używa

/**
* Fetches all rows.
*
* Honors the Zend_Db_Adapter fetch mode.
*
* @param string|array|Zend_Db_Table_Select $where OPTIONAL An SQL WHERE clause or Zend_Db_Table_Select object.
* @param string|array $order OPTIONAL An SQL ORDER clause.
* @param int $count OPTIONAL An SQL LIMIT count.
* @param int $offset OPTIONAL An SQL LIMIT offset.
* @return Zend_Db_Table_Rowset_Abstract The row results per the Zend_Db_Adapter fetch mode.
*/
public function fetchAll($where = null, $order = null, $count = null, $offset = null)
{
if (!($where instanceof Zend_Db_Table_Select)) {
$select = $this->select();
if ($where !== null) {
$this->_where($select, $where);
}
if ($order !== null) {
$this->_order($select, $order);
}
if ($count !== null || $offset !== null) {
$select->limit($count, $offset);
}
} else {
$select = $where;
}
$rows = $this->_fetch($select);
'table' => $this,
'data' => $rows,
'readOnly' => $select->isReadOnly(),
'rowClass' => $this->getRowClass(),
'stored' => true
);
$rowsetClass = $this->getRowsetClass();
if (!class_exists($rowsetClass)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($rowsetClass);
}
return new $rowsetClass($data);
}