Need a standard way to communicate the requested fields between front and back 
end for loaders
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                 Key: PIG-1459
                 URL: https://issues.apache.org/jira/browse/PIG-1459
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.7.0
            Reporter: Alan Gates


Pig currently provides no mechanism for loader writers to communicate which 
fields have been requested between the front and back end.  Since any loader 
that accepts pushed projections has to deal with this issue it would make sense 
for Pig to provide a standard mechanism for it.

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