public function setField($pField, $pDistinct = false)
    {
        Agl::validateParams(array(
            'String' => $pField,
            'Bool'         => $pDistinct
        ));

        $this->_field = array(
            static::FIELD_NAME     => $pField,
            static::FIELD_DISTINCT => $pDistinct
        );
        return $this;
    }