Our latest BigSQL Beta is now feature rich and stable. Powerful/simple/safe developers sandbox bundles are available for Linux and OSX. BigSQL leverages new features of PostgreSQL 9.3 to provide seamless & deep integration with Hadoop/Hive. The combined bundle gives you all the best OLTP features of standard ANSI PostgreSQL with all of the massive parallel query capabilities of Hive & Hadoop.
It’s 100% open source and 100% free. Take a look today at http://www.bigsql.org for Downloads, Release Notes, Tutorial, etc.