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

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.POFRJoin

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Operator>, Illustrable

public class POFRJoin
extends PhysicalOperator

The operator models the join keys using the Local Rearrange operators which are configured with the plan specified by the user. It also sets up one Hashtable per replicated input which maps the Key(k) stored as a Tuple to a DataBag which holds all the values in the input having the same key(k) The getNext() reads an input from its predecessor and separates them into key & value. It configures a foreach operator with the databags obtained from each Hashtable for the key and also with the value for the fragment input. It then returns tuples returned by this foreach operator.

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

POFRJoin(OperatorKey k, int rp, List<PhysicalOperator> inp, List<List<PhysicalPlan>> ppLists, List<List<Byte>> keyTypes, FileSpec[] replFiles, int fragment, boolean isLeftOuter, Tuple nullTuple)

POFRJoin(OperatorKey k, int rp, List<PhysicalOperator> inp, List<List<PhysicalPlan>> ppLists, List<List<Byte>> keyTypes, FileSpec[] replFiles, int fragment, boolean isLeftOuter, Tuple nullTuple, Schema[] inputSchemas, Schema[] keySchemas)

Method Summary

int	getFragment()
List<List<PhysicalPlan>>	getJoinPlans()
Result	getNextTuple()
FileSpec[]	getReplFiles()
Tuple	illustratorMarkup(Object in, Object out, int eqClassIndex) input tuple mark up to be illustrate-able
String	name()
void	setFragment(int fragment)
void	setReplFiles(FileSpec[] replFiles)
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, 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

POFRJoin

public POFRJoin(OperatorKey k,
                int rp,
                List<PhysicalOperator> inp,
                List<List<PhysicalPlan>> ppLists,
                List<List<Byte>> keyTypes,
                FileSpec[] replFiles,
                int fragment,
                boolean isLeftOuter,
                Tuple nullTuple)
         throws ExecException

Throws:

ExecException

POFRJoin

public POFRJoin(OperatorKey k,
                int rp,
                List<PhysicalOperator> inp,
                List<List<PhysicalPlan>> ppLists,
                List<List<Byte>> keyTypes,
                FileSpec[] replFiles,
                int fragment,
                boolean isLeftOuter,
                Tuple nullTuple,
                Schema[] inputSchemas,
                Schema[] keySchemas)
         throws ExecException

Throws:

ExecException

Method Detail

getJoinPlans

public List<List<PhysicalPlan>> getJoinPlans()

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.

getNextTuple

public Result getNextTuple()
                    throws ExecException

Overrides:

getNextTuple in class PhysicalOperator

Throws:

ExecException

getFragment

public int getFragment()

setFragment

public void setFragment(int fragment)

getReplFiles

public FileSpec[] getReplFiles()

setReplFiles

public void setReplFiles(FileSpec[] replFiles)

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