????? ????? ??????? ????? ?? ????? ???????. ???? ?????? ?? ??? ???????? ?????? ???? ???? ??????, ??? ???? ??? ????????. ????? ?????? ??materialized ?? ??? ??????? ?? ???????? ? ???????? ??? ??????? ?????. ???? ?????: ?????? ???? ?????? ?????? ?????? ??? ????? ?????? ??? ??? ??????? ?????????? ???

?????? ??? ???? ????? ??? ??????? ??????? ?? ??????? ?????? ?? ??? ????? ?????? ?? ???? ????? ??????? ??????? ???????? ????? ??????? ??? ????? ??????? ????? ?????? ???????. ?? ????? ???? ???? ???? ?????? ?????????? ???????????? ??????? ?? ???????? ?????? ?????? ????? ?????? ??? ????????. ?? ?????