Quoting Wikipedia :
MariaDB It is a GPL licensed MySQL derived database server. It is supported by Michael "Monty" Widenius (founder of MySQL) and the community of free software developers. It has an engine called XtraDB, replacing InnoDB. It has a high compatibility with MySQL since it has the same commands, interfaces, APIs and libraries, its objective being to be able to change one server for another directly
«We are very excited about the project LibreOffice… To do our part with the project we are committed to integrating and providing excellent support for MariaDB in LibreOffice. This includes, among other things, a new LGPL C drivers to connect to MariaDB o MySQL and provide bug fixes for any issues in MariaDB that seriously affect LibreOffice«
You can see more in this link. Without a doubt, great news for the world OpenSource y The Office Suite. Improvement LibreOffice Base with this bracket?