title: apache pig command
body: <p>just wondering what does the following command means? so hard to google topics related to pig:</p>
  
  <pre><code>pig -Dpig.usenewlogicalplan=false
  </code></pre>
  
  <p>i ran the pig script in map/reduce mode, it failed, by adding that flag(-D), it worked, but still have some issue. so what does it mean anyways? Thanks.</p>