title: How to split pipe-separated column into multiple rows?
body: <p>I have a dataframe that contains the following:</p>
  
  <pre><code>movieId / movieName / genre
  1         example1    action|thriller|romance
  2         example2    fantastic|action
  </code></pre>
  
  <p>I would like to obtain a second dataframe (from the first one), that contains the following:</p>
  
  <pre><code>movieId / movieName / genre
  1         example1    action
  1         example1    thriller
  1         example1    romance
  2         example2    fantastic
  2         example2    action
  </code></pre>
  
  <p>How I can do that?</p>