Enable merge join in pig to work with loaders which can internally index sorted 

                 Key: PIG-953
                 URL: https://issues.apache.org/jira/browse/PIG-953
             Project: Pig
          Issue Type: Improvement
    Affects Versions: 0.3.0
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath

Currently merge join implementation in pig includes construction of an index on 
sorted data and use of that index to seek into the "right input" to efficiently 
perform the join operation. Some loaders (notably the zebra loader) internally 
implement an index on sorted data and can perform this seek efficiently using 
their index. So the use of the index needs to be abstracted in such a way that 
when the loader supports indexing, pig uses it (indirectly through the loader) 
and does not construct an index. 

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