How are maps, lists, and sets represented by the driver?
They are represented as separate tables with a row per element in the collection, and an ID to allow you to join them back to the parent table. Please see the user guide for more information
Are User Defined Types supported?
User Defined Types are not currently supported due to limitations in the underlying Cassandra library. Once this has been supported in the library the driver will be upgraded to support this as well.
Does the driver support write-back?
Yes, it supports DML (INSERT, UPDATE, DELETE), and DDL (CREATE, DROP).
Is Cassandra 3.X supported?
Yes it is supported. Currently both drivers ODBC and JDBC support Cassandra 3.X