We needed to add our schema as Server Side Properties in the Advanced Options. We now see our tables in QGIS.

To view the geometry, you can use the Database Manager and choose "Virtual Layers/Project Layers" (I'm guessing, my QIGS is in French) and use 'st_geometryfromtext' to create a Query Layer. 

I tried with points, but as long as your geometry is in WKT in Databricks, it should work!