title: Storing list in cassandra
body: <p>I want to save a friends list in Cassandra where a user may have few hundred of friends  .  Should i store the list of friends, which is an email id, as a list or set in Cassandra or should i create a separate table having the columns user_id and friends which will include all the user(millions of users) along with their friends .</p>
  
  <p>If i create a separate table with user_id and friends column will there be degradation in performance while retrieving the entire friend list of the user/ one friend of the user as the table will contain many records/rows.</p>