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

Interface Summary
AccumulativeTupleBuffer This interface is used during Reduce phrase to process tuples in batch mode.
 

Class Summary
POCollectedGroup The collected group operator is a special operator used when users give the hint 'using "collected"' in a group by clause.
POCombinerPackage The package operator that packages the globally rearranged tuples into output format after the combiner stage.
POCross Recover this class for nested cross operation.
PODemux The MapReduce Demultiplexer operator.
PODistinct Find the distinct set of tuples in a bag.
POFilter This is an implementation of the Filter operator.
POForEach  
POFRJoin The operator models the join keys using the Local Rearrange operators which are configured with the plan specified by the user.
POGlobalRearrange Dummy operator to test MRCompiler.
POJoinPackage  
POLimit  
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.
POMergeCogroup  
POMergeJoin This operator implements merge join algorithm to do map side joins.
POMultiQueryPackage The package operator that packages the globally rearranged tuples into output format as required by multi-query de-multiplexer.
PONative  
POOptimizedForEach A specialized version of POForeach with the difference that in getNext(), it knows that "input" has already been attached by its input operator which SHOULD be POJoinPackage
POPackage The package operator that packages the globally rearranged tuples into output format as required by co-group.
POPackageLite This package operator is a specialization of POPackage operator used for the specific case of the order by query.
POPartialAgg Do partial aggregation in map plan.
POPartitionRearrange The partition rearrange operator is a part of the skewed join implementation.
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.
POSkewedJoin The PhysicalOperator that represents a skewed join.
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.
POSortedDistinct This operator is a variation of PODistinct, the input to this operator must be sorted already.
POSplit The MapReduce Split operator.
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.
POStream  
POUnion The union operator that combines the two inputs into a single stream.
 

Enum Summary
POPackage.PackageType  
 



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