title: Schema evolution in parquet format
body: <p>Currently we are using Avro data format in production.
  Out of several good points using Avro, we know that it is good in schema evolution.</p>
  
  <p>Now we are evaluating <strong>Parquet format</strong> because of its efficiency while reading random columns.
  So before moving forward our concern is still <strong>schema evolution</strong>.</p>
  
  <p>Does anyone know if schema evolution is possible in parquet, if yes <strong>How</strong> is it possible, if no then <strong>Why</strong> not.</p>
  
  <p>Some <a href="http://www.slideshare.net/StampedeCon/choosing-an-hdfs-data-storage-format-avro-vs-parquet-and-more-stampedecon-2015" rel="noreferrer">resources</a> claim that it is possible but it <strong>can only add columns at end</strong>.</p>
  
  <p>What does this mean?</p>