Casting elements inside a tuple does not take effect

                 Key: PIG-613
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Viraj Bhat
             Fix For: types_branch
         Attachments: myfloatdata.txt

Consider the following Pig script which casts return values of the SQUARE UDF 
which are  tuples of doubles to long. The describe output of B shows it is 
long, however the result is still double.
register statistics.jar;
A = load 'myfloatdata.txt' using PigStorage() as (doublecol:double);
B = foreach A generate (tuple(long))statistics.SQUARE(doublecol) as 
describe B;
explain B;
dump B;
Describe output of B:
B: {squares: (loadtimesq: long)}
Sample output of B:
Cause: The cast for Tuples has not been implemented in

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