title: Querying with "contains" on a list of user defined type (UDT)
body: <p>For data model like:</p>
  
  <pre><code>create type city (
     name text,
     code int
  );
  
  create table user (
      id uuid,
      name text,
      cities list&lt;FROZEN&lt;city&gt;&gt;,
      primary key ( id )
  );
  
  create index user_city_index on user(cities);
  </code></pre>
  
  <p>Querying as</p>
  
  <pre><code>select id, cities from user where cities contains {name:'My City', code: 10};
  </code></pre>
  
  <p>is working fine. But is it possible to query </p>
  
  <pre><code>select id, cities from user where cities contains {name:'My City'};
  </code></pre>
  
  <p>and discard the <code>code</code> attribute, i.e. <code>code=&lt;any&gt;</code>?</p>
  
  <p>Can this be achieved with the utilization of Spark?</p>