The Magic of Presto

Presto is a distributed SQL query engine—now an open source distributed SQL query engine—optimized for running ad-hoc interactive analytic queries against data sources ranging in size from gigabytes to petabytes. It is designed to allow organizations to query data where it lives. A single Presto query can combine data from multiple sources and provide responses in times ranging from sub-second to minutes.

via Facebook Releases Query Engine to Open Source Community – CIO.com.