Inconsistent column pruning in LOUnion

                 Key: PIG-1146
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.6.0
            Reporter: Daniel Dai
             Fix For: 0.7.0

This happens when we do a union on two relations, if one column comes from a 
loader, the other matching column comes from a constant, and this column get 
pruned. We prune for the one from loader and did not prune the constant. Thus 
leaves union an inconsistent state. Here is a script:

a = load '1.txt' as (a0, a1:chararray, a2);
b = load '2.txt' as (b0, b2);
c = foreach b generate b0, 'hello', b2;
d = union a, c;
e = foreach d generate $0, $2;
dump e;

ulysses thompson        64      1.90
katie carson    25      3.65

luke king       0.73
holly davidson  2.43

expected output:
(ulysses thompson,1.90)
(katie carson,3.65)
(luke king,0.73)
(holly davidson,2.43)

real output:
(ulysses thompson,)
(katie carson,)
(luke king,0.73)
(holly davidson,2.43)

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