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

java.lang.Object
  org.apache.pig.impl.plan.Operator<PhyPlanVisitor>
      org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
          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