[Zebra] to support pig projection push down in Zebra

                 Key: PIG-1067
                 URL: https://issues.apache.org/jira/browse/PIG-1067
             Project: Pig
          Issue Type: New Feature
    Affects Versions: 0.4.0
            Reporter: Chao Wang
            Assignee: Chao Wang
             Fix For: 0.6.0

Pig tries to determine which fields in a query script file will be needed and 
passes that information to the load function, thereby optimizing the query by 
reducing the data to be loaded.

To support this optimization, Zebra needs to implement fieldsToRead method in 
TableLoader class to utilize this information. This jira is for this new 

For more information of this optimization on pig side, one can refer to jira:  


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