title: how to save spark data frame to excel format?
body: <p>I would like to save a Spark DataFrame into Excel.</p>
  
  <p>I have done it for csv by saving csv file in each node and appending it in the server using the DataBricks spark-csv library. </p>
  
  <p>I Don't know how to do it for Excel. Somebody please suggest and idea.</p>