$this->_customQuery->query();
$this->_select = array_merge($this->_select, $this->_customQuery->_select);
$this->_element = array_merge($this->_element, $this->_customQuery->_element);
$this->_customQuery->query();
$this->_select = array_merge($this->_select, $this->_customQuery->_select);
$this->_element = array_merge($this->_element, $this->_customQuery->_element);