https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/GeneralConventions/FileStructure.html#includes-rst-txt

FAQ

DB compatibility

In most cases EXT:maps2 uses the QueryBuilder to query data, but in case of Plugin maps2_searchwithinradius we need to execute a native MySQL query without QueryBuilder to find the related POIs. In that special case MySQL/MariaDB is mandatory.