title: generate UUID automatically for all records in Cassandra for an existing dataset
body: <p>I have an existing dataset with around 700000 records in a CSV format. I have imported that data file into apache Cassandra table. The problem is </p>
  
  <p>primary key. How can I automatically generate (upsert) uuid into my primary key column for all of my records?
  I am using Cassandra 3.10.</p>