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Package org.apache.pig.impl.plan

Added Classes
MapKeysInfo  
OperatorPlan.IndexHelper  
ProjectionMap.Column A wrapper for projection map columns to contain the input number input column.
 

Changed Classes
Operator Base class for all types of operators.
OperatorPlan A generic graphing class for use by LogicalPlan PhysicalPlan etc.
RequiredFields A struct detailing how a projection is altered by an operator.