title: Update value in Cassandra DB
body: <p>I have a cassandra db and i want to update all the columns in table.</p>
  
  <p>But the column is set</p>
  
  <p>Example :</p>
  
  <pre><code>Table1
  
  Id  value
  1    ab
  2    ab,cd
  3    cd
  
  Now, I want to change all "ab" to "abc".
  </code></pre>
  
  <p>I know the normal update command wont work here, is there a way to achieve this ?</p>
  
  <pre><code>update table1 set value =abc where value =ab // This wont work.
  </code></pre>