Required fields projection in Loader: nested fields in bag, map key lookup more 
than two levels

                 Key: PIG-932
             Project: Pig
          Issue Type: Improvement
          Components: impl
    Affects Versions: 0.3.0
            Reporter: Daniel Dai

To leverage the performance features provided by Zebra, Pig should be able to 
figure out which input fields are actually used in Pig script, and prune 
unnecessary inputs. This feature is being implementing in 
[PIG-922|]. However, there are two 
limitations currently:

1. Pruning nested fields only apply to map and record. We do not prune 
sub-field inside a collection
2. For map, currently we only go one level deep. Eg, if in Pig script, user 
uses a#'key0'#'key1', a#'key0' will be asked

These two limitations are in line with current limitation of Zebra loader. Once 
Zebra loader can handle this, we need to work to lift these limitations.

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