expression with aggregate functions returning null, with accumulate interface

                 Key: PIG-1118
             Project: Pig
          Issue Type: Bug
            Reporter: Thejas M Nair

The problem is in trunk . It works fine in 0.6 branch.

l = load '/tmp/students.txt' as (a : chararray,b : chararray,c : int);
grunt> g = group l by 1;
grunt> dump g;
grunt> f = foreach g generate SUM(l.c), 1 + SUM(l.c) + SUM(l.c);
grunt> dump f;

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