Hi, Nikita! I suggest to squash commits from c4835af7e8c to 80e3007a5a1 into one. It'll be simpler, no intermediate juggling with MYSQL_TIME anymore. This squashed commit is ok to push (make sure to mention both MDEVs in the commit comment, but not necessarily in the first line) On Jul 26, Nikita Malyavin wrote:

revision-id: c4835af7e8c (mariadb-10.3.30-30-gc4835af7e8c) parent(s): ec3289b6de4 author: Nikita Malyavin committer: Nikita Malyavin timestamp: 2021-07-21 00:21:31 +0300 message:

MDEV-16026: Forbid global system_versioning_asof in non-default time zone

* store `system_versioning_asof` in unix time; * both session and global vars are processed in session timezone; * setting `default` does not copy global varibale abymore. Instead, it sets system_time to SYSTEM_TIME_UNSPECIFIED, which means that no 'AS OF' time is applied and `now()` can be assumed

Regards, Sergei VP of MariaDB Server Engineering and security@mariadb.org