title: I am getting perfect result by doing illustrate on the result of join, but dump not working on the same
body: <p>I am using the below lines of code :</p>
  
  <pre><code> student = load 'test/Pig/student' using PigStorage(' ') as (name:chararray,roll:int);
  
  result = load 'test/Pig/results' using PigStorage('\t') as (id:int,status:chararray);
  
  passroll = FILTER result by status == 'pass';
  
   store passroll into 'test/Pig/passroll';
  
  pass = load 'test/Pig/passroll/part-m-00000' using PigStorage(',') as (id:int,status:chararray);
  
   stupass = JOIN pass by id, student by roll;
  
  studentname = FOREACH stupass GENERATE student::name;
  </code></pre>
  
  <p>illustrate <code>studentname</code> is giving perfect result of student names those who have pass.</p>
  
  <p>but dump <code>studentname</code> is giving Encountered Warning <code>ACCESSING_NON_EXISTENT_FI
  ELD 19 time(s)</code>.</p>