title: Cassandra row level isolation
body: <p>I have a table created in cql :</p>
  
  <pre><code>create table isolation_demo(key text,column1 text,column2 text,column3 text ,primary key(key,column1,column2));
  </code></pre>
  
  <p>I have 2 statement in a batch.</p>
  
  <pre><code>update isolation_demo set column3 ='ABC' where key =1 and column1 =1 and column2=1;
  delete from isolation_demo where key =1 and column1 =2 and column2=2;
  </code></pre>
  
  <p>here the both statements share same partition key. (key=1), but different clustering column values. Will these 2 statements be isolated?</p>