title: how to get number of days between two java.sql.timestamp field in scala
body: <p>I am having two fields of <code>java.sql.timestamp</code> type in my dataframe and I want to find number of days between these two column</p>
  
  <p>Below is the format of my data : *2016-12-23 23:56:02.0 (yyyy-MM-dd HH:mm:ss.S)</p>
  
  <p>I had tried lots of method but did not find any solution. So can any one help here.</p>