title: Join vs COGROUP in PIG
body: <p>Are there any advantages (wrt performance / no of map reduces ) when i  use COGROUP instead of JOIN in pig ? </p>
  
  <p><a href="http://developer.yahoo.com/hadoop/tutorial/module6.html" rel="noreferrer">http://developer.yahoo.com/hadoop/tutorial/module6.html</a> talks about the difference in the type of output they produce. But, ignoring the "output schema", are there any significant difference in performance ? </p>