PERFORMANCE: Sampler for order bys does not produce a good distribution

                 Key: PIG-545
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Alan Gates
             Fix For: types_branch

In running tests on actual data, I've noticed that the final reduce of an order 
by has skewed partitions.  Some reduces finish in a few seconds while some run 
for 20 minutes.  Getting a better distribution should lead to much better 
performance for order by.

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