title: How to address fields in Pig Latin after loading
body: <p>Have a large file with a lot of columns file which I am loading like</p>
  
  <pre><code>A = LOAD '/path/to/file' USING PigStorage(',');
  
  B = FOREACH A GENERATE $0 AS name, $1 as address, $2.. ;
  C = FOREACH B FILTER BY (name is NOT NULL);
  </code></pre>
  
  <p>I get an error that projected field [name] does not exist? I dont want to address columns by doing $0, $1 and all that . How can I give them some identifiers ?</p>