title: Unable to change/alter the data type of column in cql cassandra
body: <pre><code>CREATE TABLE mykespace.newtable (
      name text PRIMARY KEY,
      marks int,
      score float,
      value float,
      value2 blob
  )
  
  cqlsh:mykespace&gt; alter table newtable alter value type int;
  InvalidRequest: Error from server: code=2200 [Invalid query] message="Altering of types is not allowed"
  
  cqlsh:mykespace&gt; alter table newtable alter value2 type varint;
  InvalidRequest: Error from server: code=2200 [Invalid query] message="Altering of types is not allowed"
  </code></pre>
  
  <p>unable to change data type , even int to varint , and float to int</p>