title: What is the benefit of using nested data types in Parquet?
body: <p>Is there any performance benefit resulting from the usage of using nested data types in the Parquet file format?</p>
  
  <p>AFAIK Parquet files are usually created specifically for query services e.g. Athena, so the process which creates those might as well simply flatten the values - thereby allowing easier querying, simpler schema, and retaining the column statistics for each column.</p>
  
  <p>What benefit is there to be gained by using nested data types e.g. <code>struct</code>?</p>