title: Redshift per-user concurrent queries
body: <p>I've got a Redshift WLM queue set to a concurrency of 8 for a single group.  In this group, I've got one user ('looker', my primary BI tool) that runs lots of queries concurrently.  </p>
  
  <p>My understanding of this is: up to 8 queries can be run by all members of this group.  But can a single user get to run up to 8 queries concurrently?  Or will the fact that it's a single user act as a bottleneck on the number of queries it can run concurrently?</p>