title: From PostgreSQL to Cassandra - Aggregation functions not supported
body: <p>I need your advise please. I have an application that runs on PostgreSQL but takes too long to bring back data.
  I would like to use Cassandra but noticed that CQL does not support aggregation.
  Would that be possible with Hadoop or am I going completely the wrong way?
  Also all the dates are stored in Epoch, and CQL can't convert them.</p>
  
  <p>What would be the best approach to convert an application that runs on PostGreSQL to Cassandra?</p>
  
  <p>Thank you for any suggestions.</p>