Storage access layer

                 Key: PIG-833
             Project: Pig
          Issue Type: New Feature
            Reporter: Jay Tang

A layer is needed to provide a high level data access abstraction and a tabular 
view of data in Hadoop, and could free Pig users from implementing their own 
data storage/retrieval code.  This layer should also include a columnar storage 
format in order to provide fast data projection, CPU/space-efficient data 
serialization, and a schema language to manage physical storage metadata.  
Eventually it could also support predicate pushdown for further performance 
improvement.  Initially, this layer could be a contrib project in Pig and 
become a hadoop subproject later on.

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