title: OUTER JOIN of multiple tables in Pig
body: <p>I need to join multiple tables. The command that I am using is as follows:</p>
  
  <pre><code>G = JOIN aa BY f, bb by f, cc by f, dd by f;
  </code></pre>
  
  <p>To make it a full outer join, I added a <code>FULL</code> to make it:</p>
  
  <pre><code>G = JOIN aa BY f FULL, bb by f, cc by f, dd by f;
  </code></pre>
  
  <p>But it gives me a <code>mismatched input</code> error message. How should I make this work?</p>
  
  <p>Thanks!</p>