title: How to convert a sparse vector to dense in Scala Spark?
body: <p>I have a sparse vector:</p>
  
  <pre><code>(453,[0,4,11,16,39,56,109],[1.0,1.0,1.0,1.0,1.0,1.0,1.0])
  </code></pre>
  
  <p>and I need to convert it into dense vector (should be able to see all 453 values). </p>
  
  <p>How to do that in Scala Spark?</p>