Is there a way to have combined permissions, based on both row and column? For example, considering the `passwd` table example https://www.postgresql.org/docs/

Is there a way to have combined permissions, based on both row and column? For example, considering the `passwd` table example https://www.postgresql.org/docs/9.6/static/ddl-rowsecurity.html https://www.postgresql.org/docs/9.6/static/ddl-rowsecurity.h..., allowing user to select their own pwhash, but no other users' pwhashes. I find owner-dependent field-level permissions to be a fairly frequent requirement.