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Since we introduced unlogged sequences in v15, identity sequences have defaulted to having the same persistence as their owning table. However, it is possible to change that with ALTER SEQUENCE, and pg_dump tries to preserve the logged-ness of sequences when it doesn't match (as indeed it wouldn't for an unlogged table from before v15). The fly in the ointment is that ALTER SEQUENCE SET [UN]LOGGED fails in binary-upgrade mode, because it needs to assign a new relfilenode which we cannot permit in that mode. Thus, trying to pg_upgrade a database containing a mismatching identity sequence failed. To fix, add syntax to ADD/ALTER COLUMN GENERATED AS IDENTITY to allow the sequence's persistence to be set correctly at creation, and use that instead of ALTER SEQUENCE SET [UN]LOGGED in pg_dump. (I tried to make SET [UN]LOGGED work without any pg_dump modifications, but that seems too fragile to be a desirable answer. This way should be markedly faster anyhow.) In passing, document the previously-undocumented SEQUENCE NAME option that pg_dump also relies on for identity sequences; I see no value in trying to pretend it doesn't exist. Per bug #18618 from Anthony Hsu. Back-patch to v15 where we invented this stuff. Discussion: https://postgr.es/m/18618-d4eb26d669ed110a@postgresql.org
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.