For columnar and massively-parallel workloads, Greenplum was opensourced this year[0]. It was originally forked from PostgreSQL 8.2. There's also Apache HAWQ (

For columnar and massively-parallel workloads, Greenplum was opensourced this year[0]. It was originally forked from PostgreSQL 8.2. There's also Apache HAWQ (incubating), which takes Greenplum's SQL parser and distributed query planner to use as front-ends for Hadoop[1]. Disclaimer: I work for Pivotal, which opensourced these systems. [0] http://greenplum.org/ http://greenplum.org/ [1] http://hawq.incubator.apache.org/ http://hawq.incubator.apache.org/