In your case, the dir /usr/share/mariadb doesn’t exist but /usr/share/mysql does. To fix it:
ln -s /usr/share/mysql /usr/share/mariadb
systemctl restart mariadb
In your case, the dir /usr/share/mariadb doesn’t exist but /usr/share/mysql does. To fix it:
ln -s /usr/share/mysql /usr/share/mariadb
systemctl restart mariadb