MariaDB permissions issues
MariaDB 10.2 is not able to properly complete requests with the expected permissions as written in the documentation as there seems to be code attempting to run a "SHOW PROCESSLIST" command. It is throwing an error about not having access to PROCESS privileges. Changing the grant access to ALL seems to get past the civicrm_strip_non_numeric errors, but not the enabling of Full Text Search. Here's a link to the MatterMost discussion thread: https://chat.civicrm.org/civicrm/pl/neezo39z1i8a3b8ifwi4s4tchc
Here's a specific comment made by totten about the creation of the function civicrm_strip_non_numeric that is specifically known to cause this issue: https://chat.civicrm.org/civicrm/pl/bemk3pozmbynzm4ba1rjda1feo