On Oct 13, Pavel Ivanov wrote:
> > For example, in MariaDB one can use InnoDB
> > for system tables too. Always could, even in 5.5, it's not a new
> > feature. There is no code that limits system tables to a specific
> > storage engine.
> This is not true even in MariaDB 10.2:
> And that's only the explicit restriction. Even when you remove that
> you still need a lot of other code changes to make MariaDB work with
> system tables using InnoDB. There are many places assuming that system
> tables are not transactional.
That's basically what I said - the server doesn't limit system tables to
a specific engine. Every engine can decide for itself. And InnoDB,
apparently, doesn't want to create mysql.host, mysql.user, and mysql.db
verifies that mysql.plugin works when altered to InnoDB
verifies that mysql.time_zone_name works when altered to InnoDB
This is not a very popular use case, we had no bug reports about
mysql.host, mysql.user, and mysql.db in InnoDB. Otherwise this would've
been fixed too.
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