When you connect for the first time, SQL will create a user in that DB called domain.username and map it’s default schema to domain.username as well.

Database support has been upgraded to include Apache Hive 2.1, Cloudera 5.8, DB2 LUW 11.1, Hortonworks 2.5, MapR 5.1, MongoDB 3.4, MySQL 5.7, PostgreSQL 9.5, SQL Server 2016, Vertica 8, VoltDB 6.8 ...