[zebra] Zebra Performance Optimizations

                 Key: PIG-1098
                 URL: https://issues.apache.org/jira/browse/PIG-1098
             Project: Pig
          Issue Type: Improvement
            Reporter: Yan Zhou
            Assignee: Yan Zhou
            Priority: Minor

Many in-core performance optimization opportunities exist in zebra, such as 
removal of redundant precautionary checks, use of better collection types to 
reduce levels of indirection to the memory objects, changing of input splits in 
ascending sizes to descending sizes. Observed protyped improvements are around 
10% wall clock time improvements.

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