title: Do Parquet Metadata Files Need to be Rolled-back?
body: <p>When a Parquet file <code>data</code> is written with partitioning on its <code>date</code> column we get a directory structure like:</p>
  
  <pre><code>/data
      _common_metadata
      _metadata
      _SUCCESS
      /date=1
          part-r-xxx.gzip
          part-r-xxx.gzip
      /date=2
          part-r-xxx.gzip
          part-r-xxx.gzip
  </code></pre>
  
  <p>If the partition <code>date=2</code> is deleted without the involvement of Parquet utilities (via the shell or file browser, etc)  do any of the metadata files need to be rolled back to when there was only the partition <code>date=1</code>?</p>
  
  <p>Or is it ok to delete partitions at will and rewrite them (or not) later?</p>