It seems this was fixed in https://salsa.debian.org/mariadb-team/mariadb-10.1/commit/60b9d396b7712c46924564c6a73a0c02ff88f0ed
- Bug#920854: [debian-mysql] Bug#920854: mariadb-10.1: FTB... Otto Kekäläinen
- Bug#920854: [debian-mysql] Bug#920854: mariadb-10.1... Julien Cristau
- Bug#920854: [debian-mysql] Bug#920854: mariadb-... Otto Kekäläinen