org.apache.pig.pen.physicalOperators
Class POCogroup

java.lang.Object
  extended by org.apache.pig.impl.plan.Operator<PhyPlanVisitor>
      extended by org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
          extended by org.apache.pig.pen.physicalOperators.POCogroup
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class POCogroup
extends PhysicalOperator

This is a local implementation of Cogroup. The inputs need to be connected to LocalRearranges possibly by the logical to physical translator. This is a blocking operator. The outputs of LRs are put into SortedDataBags. They are sorted on the keys. We then start pulling tuple out of these bags and start constructing output.

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
alias, dummyBag, dummyBool, dummyDBA, dummyDouble, dummyFloat, dummyInt, dummyLong, dummyMap, dummyString, dummyTuple, input, inputAttached, inputs, lineageTracer, outputs, parentPlan, pigLogger, reporter, requestedParallelism, res, resultType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
POCogroup(OperatorKey k)
           
POCogroup(OperatorKey k, int rp)
           
POCogroup(OperatorKey k, int rp, List<PhysicalOperator> inp)
           
POCogroup(OperatorKey k, List<PhysicalOperator> inp)
           
 
Method Summary
 Result getNext(Tuple t)
           
 String name()
           
 void setInner(boolean[] inner)
           
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 boolean supportsMultipleOutputs()
          Indicates whether this operator supports multiple outputs.
 void visit(PhyPlanVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
attachInput, clone, cloneHelper, detachInput, getAlias, getAliasString, getInputs, getLogger, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getPigLogger, getRequestedParallelism, getResultType, isAccumStarted, isAccumulative, isBlocking, isInputAttached, processInput, reset, setAccumEnd, setAccumStart, setAccumulative, setAlias, setInputs, setLineageTracer, setParentPlan, setPigLogger, setReporter, setRequestedParallelism, setResultType
 
Methods inherited from class org.apache.pig.impl.plan.Operator
compareTo, equals, getOperatorKey, getProjectionMap, hashCode, regenerateProjectionMap, rewire, toString, unsetProjectionMap
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

POCogroup

public POCogroup(OperatorKey k)

POCogroup

public POCogroup(OperatorKey k,
                 int rp)

POCogroup

public POCogroup(OperatorKey k,
                 List<PhysicalOperator> inp)

POCogroup

public POCogroup(OperatorKey k,
                 int rp,
                 List<PhysicalOperator> inp)
Method Detail

setInner

public void setInner(boolean[] inner)

visit

public void visit(PhyPlanVisitor v)
           throws VisitorException
Description copied from class: Operator
Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:
visit in class PhysicalOperator
Parameters:
v - Visitor to visit with.
Throws:
VisitorException - if the visitor has a problem.

name

public String name()
Specified by:
name in class Operator<PhyPlanVisitor>

getNext

public Result getNext(Tuple t)
               throws ExecException
Overrides:
getNext in class PhysicalOperator
Throws:
ExecException

supportsMultipleInputs

public boolean supportsMultipleInputs()
Description copied from class: Operator
Indicates whether this operator supports multiple inputs.

Specified by:
supportsMultipleInputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.

supportsMultipleOutputs

public boolean supportsMultipleOutputs()
Description copied from class: Operator
Indicates whether this operator supports multiple outputs.

Specified by:
supportsMultipleOutputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.


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