Dear Heinz,

The SYS_TABLESPACES and SYS_DATAFILES tables were introduced in MySQL
5.6 and MariaDB Server 10.0, to prepare for supporting CREATE
TABLESPACE for InnoDB tables. That support was implemented in MySQL
5.7, but never in MariaDB Server. (I don't see which problem CREATE
TABLESPACE would be solving. Okay, in
https://jira.mariadb.org/browse/MDEV-29985 you can find some
motivation for creating user tables in the InnoDB system tablespace.)

These tables were removed in
https://jira.mariadb.org/browse/MDEV-22343. However, old tables were
never dropped from the system tablespace. I posted a reminder about
this to https://jira.mariadb.org/browse/MDEV-36722 which is how I
think the autoshrink feature needs to be redesigned and reimplemented.

With best regards,

Marko
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