The main focus of MapD is scan queries where you might need to look at billions of rows to do the group bys, joins and aggregates to answer a query.  Indexes don&#x27;t tend to do well for such use cases.<p>In the future we may add indexes such that looking up a single or small number of rows is as fast as possible (such operations fast now since the GPU scans are so fast, but not as fast as they would be if we had indexes)