????/??????????????????????????? & ??? ???????????????? [?????????] - [????????] ???????????????????????????????????????????????????? ???????????????????????????????????? ??????????????????????????????????????????? ???????????????????????????????????????????????????????? ???????????????

For the majority of relations the result is similar to pg_class.relfilenode, but for certain process catalogs relfilenode is zero and this operate should be used to get the correct benefit. The functionality returns NULL if handed a relation that does not have storage, like a see. PG slots are so