Problem in using negative (-a)
------------------------------

                 Key: PIG-522
                 URL: https://issues.apache.org/jira/browse/PIG-522
             Project: Pig
          Issue Type: Bug
    Affects Versions: types_branch
            Reporter: Santhosh Srinivasan
             Fix For: types_branch


Using negative, i.e., -a leads to exceptions. 

{code}
grunt> a = load 'myfile' as  (name:chararray, age:int, gpa:double);
grunt> b = foreach a generate -gpa;
grunt> dump b;

2008-11-10 16:38:12,517 [main] INFO  
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher 
- 0% complete
2008-11-10 16:38:37,539 [main] ERROR 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher 
- Map reduce job failed
2008-11-10 16:38:37,540 [main] ERROR 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher 
- Job failed!
2008-11-10 16:38:37,542 [main] ERROR 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.Launcher - Error 
message from task (map) task_200809241441_19426_m_000000java.io.IOException: 
Received Error while processing the map plan.
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:197)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:158)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.map(PigMapOnly.java:65)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
        at 
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)

{code}

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