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Class org.apache.pig.backend.hadoop.executionengine.tez.plan.optimizer.UnionOptimizer

Added Methods
void connectPredecessorsToVertexGroups(TezOperator, TezOperator, PhysicalPlan, TezOperator[], TezOperator[]) Connects the unionOp predecessor to the store vertex groups and the output vertex groups and disconnects it from the unionOp.
boolean isOptimizable(TezOperator)