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GIS data
I would like to store and query GIS data, I saw that MariaDB can support that, but I'm not sure how to work with it via Appwrite
TL;DR
Appwrite uses the Utopia-PHP database module, which doesn't fully support all features of MariaDB, including GIS data. However, there is a solution. You can follow Steven's article on using Appwrite with location to store and query GIS data. The article provides guidance on how to work with GIS data via Appwrite. 
Appwrite uses the Utopia-PHP database module is "hiding" the fact that MariaDB is the database for being able to use universal DB adapter. as of such you won't be able to use all MariaDB features GIS is one of them.
Check Steven's article about using Appwrite with location
