title: How does "DROP TABLE IF EXISTS" work in Cassandra?
body: <p>I'm trying to understand the syntax of <code>DROP TABLE IF EXISTS</code> in Cassandra.</p>
  
  <p><code>DROP TABLE IF EXISTS nonexistanttable;</code> does not seem to work:</p>
  
  <pre><code>$ ./cqlsh
  Connected to Test Cluster at localhost:9160.
  [cqlsh 4.1.1 | Cassandra 2.0.5 | CQL spec 3.1.1 | Thrift protocol 19.39.0]
  Use HELP for help.
  cqlsh&gt; USE Foo;
  cqlsh:foo&gt; DROP TABLE IF EXISTS bar;
  Bad Request: unconfigured columnfamily bar
  </code></pre>
  
  <p>What am I doing wrong?</p>