org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators
Class POSkewedJoin

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.backend.hadoop.executionengine.physicalLayer.relationalOperators.POSkewedJoin
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>, Illustrable

public class POSkewedJoin
extends PhysicalOperator

The PhysicalOperator that represents a skewed join. It must have two inputs. This operator does not do any actually work, it is only a place holder. When it is translated into MR plan, a POSkewedJoin is translated into a sampling job and a join job.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
PhysicalOperator.OriginalLocation
 
Field Summary
 
Fields inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
alias, illustrator, input, inputAttached, inputs, lineageTracer, outputs, parentPlan, pigLogger, requestedParallelism, res, resultType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
POSkewedJoin(OperatorKey k)
           
POSkewedJoin(OperatorKey k, int rp)
           
POSkewedJoin(OperatorKey k, int rp, List<PhysicalOperator> inp, boolean[] flags)
           
POSkewedJoin(OperatorKey k, List<PhysicalOperator> inp, boolean[] flags)
           
 
Method Summary
 void addSchema(Schema s)
           
 boolean[] getInnerFlags()
           
 MultiMap<PhysicalOperator,PhysicalPlan> getJoinPlans()
           
 Schema getSchema(int i)
           
 Tuple illustratorMarkup(Object in, Object out, int eqClassIndex)
          input tuple mark up to be illustrate-able
 String name()
           
 void setJoinPlans(MultiMap<PhysicalOperator,PhysicalPlan> joinPlans)
           
 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
addOriginalLocation, addOriginalLocation, attachInput, clone, cloneHelper, detachInput, getAlias, getAliasString, getIllustrator, getInputs, getLogger, getNext, getNextBigDecimal, getNextBigInteger, getNextBoolean, getNextDataBag, getNextDataByteArray, getNextDateTime, getNextDouble, getNextFloat, getNextInteger, getNextLong, getNextMap, getNextString, getNextTuple, getOriginalLocations, getPigLogger, getReporter, getRequestedParallelism, getResultType, isAccumStarted, isAccumulative, isBlocking, isInputAttached, processInput, reset, setAccumEnd, setAccumStart, setAccumulative, setIllustrator, setInputs, 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

POSkewedJoin

public POSkewedJoin(OperatorKey k)

POSkewedJoin

public POSkewedJoin(OperatorKey k,
                    int rp)

POSkewedJoin

public POSkewedJoin(OperatorKey k,
                    List<PhysicalOperator> inp,
                    boolean[] flags)

POSkewedJoin

public POSkewedJoin(OperatorKey k,
                    int rp,
                    List<PhysicalOperator> inp,
                    boolean[] flags)
Method Detail

getInnerFlags

public boolean[] getInnerFlags()

getJoinPlans

public MultiMap<PhysicalOperator,PhysicalPlan> getJoinPlans()

setJoinPlans

public void setJoinPlans(MultiMap<PhysicalOperator,PhysicalPlan> joinPlans)

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>

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.

addSchema

public void addSchema(Schema s)

getSchema

public Schema getSchema(int i)

illustratorMarkup

public Tuple illustratorMarkup(Object in,
                               Object out,
                               int eqClassIndex)
Description copied from interface: Illustrable
input tuple mark up to be illustrate-able

Parameters:
in - input tuple
out - output tuple before wrapped in ExampleTuple
eqClassIndex - index into equivalence classes in illustrator
Returns:
tuple


Copyright © 2007-2012 The Apache Software Foundation