title: How do I add a column, preserving the existing columns, without listing them all?
body: <p>I want to add a new column to an alias, preserving all the existing ones.</p>
  
  <pre><code>A = foreach A generate
    A.id as id, 
    A.date as date, 
    A.foo as foo, 
    A.bar as bar, 
    A.foo / A.bar as foobar;
  </code></pre>
  
  <p>Can I do that without listing all of them explicitly?</p>