title: Update a collection type of a custom type in cassandra
body: <p>How can I append a new element to a set which is in a custom type in Cassandra.</p>
  
  <p>custom_type is :</p>
  
  <pre><code>CREATE TYPE custom_type (
     normal_type    TEXT,
     set_type Set&lt;TEXT&gt;
  );
  </code></pre>
  
  <p>and the table to be updated is :</p>
  
  <pre><code>CREATE TABLE test_table (
     id          TEXT,
     my_type      FROZEN&lt;custom_type&gt;,
     clustering_key TEXT,
     PRIMARY KEY ((id),clustering_key)
  );
  </code></pre>
  
  <p>Tried below query but did not work.</p>
  
  <pre><code>@Query("update test_table set  my_type.set_type = my_type.set_type + {'newelement'} where id=?1 and clustering_key=?2")
  </code></pre>
  
  <p>Any Idea on how to do that?
  Using <code>[cqlsh 5.0.1 | Cassandra 3.11.1 | CQL spec 3.4.4</code></p>