title: How to use both dataset.select and selectExpr in apache spark
body: <p>I want below mentioned data using Spark (2.2) dataset </p>
  
  <pre><code>Name    Age Age+5
  
  A       10  15
  
  B       5   10
  
  C       25  30
  </code></pre>
  
  <p>I tried using the following : </p>
  
  <pre><code>dataset.select( 
          dataset.col("Name"), 
          dataset.col("Age),
          dataset.col( dataset.selectExpr("Age"+5).toString() )
         );
  </code></pre>
  
  <p>This throws exception as <code>Age</code> column not found.</p>