Laurenz Albe takes a peek at an upcoming feature:
Everybody wants good performance. When it comes to the execution of SQL statements, accurate optimizer statistics are key. With the upcoming v18 release, PostgreSQL will preserve the optimizer statistics during an upgrade with dump/restore or
pg_upgrade(see commit 1fd1bd8710 and following). With the beta testing season for PostgreSQL v18 opened, it is time to get acquainted with the new feature.
It’s kind of wild to me that this wasn’t in place years ago for PostgreSQL.