title: Column family ID mismatch during ALTER TABLE
body: <p>When adding a column to a table using <code>cqlsh</code>, I get the following error message:</p>
  
  <pre><code>ALTER TABLE table ADD dataVersion text;
  
  ServerError: java.lang.RuntimeException: java.util.concurrent.ExecutionException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found dbed2170-c53c-11e7-a6f8-6fd66506919d; expected db9404f0-c53c-11e7-8529-65b72ab1f7cf)
  </code></pre>
  
  <p>What does it really mean and what should I do with it? Is it a bug? The column seems to be added successfully.</p>
  
  <p>Cassandra version is 3.0.14</p>