if new cluster bootstrap superuser name is not the same as old one. "GRANT x TO y GRANTED BY no_bootstrap_superuser; " will have error.
---pg15 dump content.
CREATE ROLE jian;
ALTER ROLE jian WITH SUPERUSER INHERIT CREATEROLE CREATEDB LOGIN REPLICATION BYPASSRLS;
CREATE ROLE regress_priv_user1;
ALTER ROLE regress_priv_user1 WITH NOSUPERUSER INHERIT NOCREATEROLE NOCREATEDB LOGIN NOREPLICATION NOBYPASSRLS;
CREATE ROLE regress_priv_user2;
ALTER ROLE regress_priv_user2 WITH NOSUPERUSER INHERIT NOCREATEROLE NOCREATEDB LOGIN NOREPLICATION NOBYPASSRLS;
CREATE ROLE su1;
ALTER ROLE su1 WITH SUPERUSER INHERIT CREATEROLE NOCREATEDB LOGIN NOREPLICATION NOBYPASSRLS;
GRANT regress_priv_user1 TO regress_priv_user2 GRANTED BY su1;
-----------restore in pg16
\i /home/jian/Desktop/dumpall_schema.sql
2023-05-22 08:46:00.170 CST [456584] ERROR: permission denied to grant privileges as role "su1"
2023-05-22 08:46:00.170 CST [456584] DETAIL: The grantor must have the ADMIN option on role "regress_priv_user1".
2023-05-22 08:46:00.170 CST [456584] STATEMENT: GRANT regress_priv_user1 TO regress_priv_user2 GRANTED BY su1;
psql:/home/jian/Desktop/dumpall_schema.sql:32: ERROR: permission denied to grant privileges as role "su1"
DETAIL: The grantor must have the ADMIN option on role "regress_priv_user1".