title: Getting "null" when selecting second or futher columns in Spark DataFrame
body: <p>so I have e.g. the following XML file:</p>
  
  <pre><code>&lt;root&gt;
    &lt;first&gt;
      &lt;a&gt;textA&lt;/a&gt;
    &lt;/first&gt;
    &lt;second&gt;
      &lt;b&gt;textB&lt;/b&gt;
    &lt;/second&gt;
    &lt;third&gt;
      &lt;c&gt;textC&lt;/c&gt;
    &lt;/third&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>I load it into Spark through the DataBricks XML package, and everything looks good and loaded correctly.
  When I try to select <code>first</code>or <code>first.a</code>, then I get the result correctly.</p>
  
  <p>But if I try to get <code>second</code> or <code>second.b</code>, or <code>third</code> or <code>third.c</code>, then I get <code>null</code>.</p>
  
  <p>I tried with a direct query, select function, everything, I don't know what the problem is.
  The rowTag is root.
  Any ideas?</p>
  
  <p><strong>Update</strong>: Never mind, apparently it was a bug in the spark-xml package. Thanks.</p>