public function getUsers() {
        $select = $this->tableGateway->getSql()->select();
        $select->columns(["fullname" => new Expression("DISTINCT(CONCAT(usr_firstname, ' ', usr_lastname))")]);
        $select->join('melis_core_user',
            'melis_core_user.usr_id = melis_hist_page_historic.hist_user_id',
            [],
            $select::JOIN_INNER
        );
        $resultSet = $this->tableGateway->selectWith($select);

        return $resultSet;
    }