Tableau offers the MySQL connector, a supplemental library that also works for MariaDB (MariaDB is an offshoot from MySQL).  You can connect to MariaDB directly using Tableau's MySQL connector.

Please select MySQL under Connect- To a Server.  Next in the MySQL window please input the following information:

Server= MariaDB hostname

Username= MariaDB username

Password= MariaDB password

Make sure to select the Require SSL box and the No custom configuration file specified (click to change)... checkbox:

Next in the Configure SSL Certificate window, please select Use the following custom SSL certificate file and Browse to input the path on your local hard drive to your ca-cert.pem file.  For detailed information on your certificate file please refer to our detailed section on ca-cert.pem.  Then click OK.

Now you may Sign in in the MySQL windown and connect to MariaDB.