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Package org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators

Added Classes and Interfaces
AccumulativeTupleBuffer This interface is used during Reduce phrase to process tuples in batch mode.
POCollectedGroup The collected group operator is a special operator used when users give the hint 'using "collected"' in a group by clause.
POMergeJoin This operator implements merge join algorithm to do map side joins.
POPartitionRearrange The partition rearrange operator is a part of the skewed join implementation.
POSkewedJoin The PhysicalOperator that represents a skewed join.
POSortedDistinct This operator is a variation of PODistinct the input to this operator must be sorted already.
 

Changed Classes
POCombinerPackage The package operator that packages the globally rearranged tuples into output format after the combiner stage.
PODemux The MapReduce Demultiplexer operator.
POFRJoin The operator models the join keys using the Local Rearrange operators which are configured with the plan specified by the user.
POForEach  
POLoad The load operator which is used in two ways: 1) As a local operator it can be used to load files 2) In the Map Reduce setting it is used to create jobs from MapReduce operators which keep the loads and stores in the Map and Reduce Plans till the job is created
POLocalRearrange The local rearrange operator is a part of the co-group implementation.
POLocalRearrangeForIllustrate The local rearrange operator is a part of the co-group implementation.
POMultiQueryPackage The package operator that packages the globally rearranged tuples into output format as required by multi-query de-multiplexer.
POPackage The package operator that packages the globally rearranged tuples into output format as required by co-group.
POPreCombinerLocalRearrange A specialized local rearrange operator which behaves like the regular local rearrange in the getNext() as far as getting its input and constructing the "key" out of the input.
POSort This implementation is applicable for both the physical plan and for the local backend as the conversion of physical to mapreduce would see the SORT operator and take necessary steps to convert it to a quantile and a sort job.
POStore The store operator which is used in two ways: 1) As a local operator it can be used to store files 2) In the Map Reduce setting it is used to create jobs from MapReduce operators which keep the loads and stores in the Map and Reduce Plans till the job is created
POStoreImpl This class is used to specify the actual behavior of the store operator just when ready to start execution.