1) The presentation discusses Druid, an open source analytics engine that can perform aggregations on memory mapped data in sub-second time. 2) It describes how Druid fits into their software stack at the API layer and how they extend its capabilities through a SQL interface and addressing limitations like limited querying and missing features like distinct counts. 3) Examples of SQL queries again
![July 2014 HUG : Pushing the limits of Realtime Analytics using Druid](https://cdn-ak-scissors.b.st-hatena.com/image/square/ad698938a26995f4469b6479718e6b51767591a2/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Fpushingthelimitsofrealtimeanalyticswithdruidv3-140718210638-phpapp01-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)