title: Left Anti join in Spark dataframes
body: <p>I have two dataframes, and I would like to retrieve only the information of one of the dataframes, which is not found in the inner join, see the picture:</p>
  
  <p><img src="https://i.stack.imgur.com/4Ir2W.png" alt="Full outer join"></p>
  
  <p>I have tried several ways: Inner join and filtering the rows that return at least one null, all the types of joins described on the docs for <strong>Spark 1.6</strong> but failed to do obtain the results from just one join.</p>
  
  <p>Can anybody help?</p>