Tokudb 5.7 [Warning] The partition engine is deprecated and will be removed in a future release
It remains to be seen.

Oracle's MySQL 8.0 is


Moving partitioning support into the InnoDB engine.
Removing MyISAM.
Building a "Data Dictionary" (in InnoDB tables) that replaces .frm files, etc.


This leads to action items for the "forks" -- MariaDB, Percona, Aurora, etc.:


Continue to keep MyISAM, TokuDB, Aria, etc.?  Or abandon?
Abandon Partitioning for that engine?  Or re-implement it?
Implement usage of the Data Dictionary for that engine?  Or keep old mechanism?


Attend Percona Live in April; there will be plenty of Percona, etc, folks there to address the question (if they have decided by then).