title: Storing results of UNION in PIG in a single file
body: <p>I have a PIG Script which produces four results
  I want to store all of them in a single file. 
  I tries using <code>UNION</code>, however when I use <code>UNION</code> I get four files part-m-00000, part-m-00001, part-m-00002, part-m-00003. Cant I get a single file?</p>
  
  <p>Here is the PIG script</p>
  
  <pre><code>A = UNION Message_1,Message_2,Message_3,Message_4 into 'AA';
  </code></pre>
  
  <p>Inside the AA folder I get 4 files as mentioned above. Can't I get a single file with all entries in it?</p>