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

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.POCollectedGroup

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Operator>, Illustrable

public class POCollectedGroup
extends PhysicalOperator

The collected group operator is a special operator used when users give the hint 'using "collected"' in a group by clause. It implements a map-side group that collects all records for a given key into a buffer. When it sees a key change it will emit the key and bag for records it had buffered. It will assume that all keys for a given record are collected together and thus there is not need to buffer across keys.

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

protected byte	keyType
protected List<ExpressionOperator>	leafOps
protected static TupleFactory	mTupleFactory
protected List<PhysicalPlan>	plans
protected static long	serialVersionUID

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

POCollectedGroup(OperatorKey k)

POCollectedGroup(OperatorKey k, int rp)

POCollectedGroup(OperatorKey k, int rp, List<PhysicalOperator> inp)

POCollectedGroup(OperatorKey k, List<PhysicalOperator> inp)

Method Summary

void	attachInput(Tuple t) Overridden since the attachment of the new input should cause the old processing to end.
protected Tuple	constructOutput(List<Result> resLst, Tuple value)
byte	getKeyType()
Result	getNextTuple()
List<PhysicalPlan>	getPlans()
Tuple	illustratorMarkup(Object in, Object out, int eqClassIndex) input tuple mark up to be illustrate-able
String	name()
void	setKeyType(byte keyType)
void	setPlans(List<PhysicalPlan> plans)
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, 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

Field Detail

serialVersionUID

protected static final long serialVersionUID

See Also:

Constant Field Values

mTupleFactory

protected static final TupleFactory mTupleFactory

plans

protected List<PhysicalPlan> plans

leafOps

protected List<ExpressionOperator> leafOps

keyType

protected byte keyType

Constructor Detail

POCollectedGroup

public POCollectedGroup(OperatorKey k)

POCollectedGroup

public POCollectedGroup(OperatorKey k,
                        int rp)

POCollectedGroup

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

POCollectedGroup

public POCollectedGroup(OperatorKey k,
                        int rp,
                        List<PhysicalOperator> inp)

Method Detail

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.

attachInput

public void attachInput(Tuple t)

Overridden since the attachment of the new input should cause the old processing to end.

Overrides:

attachInput in class PhysicalOperator

Parameters:

t - - The tuple that should be used as input

getNextTuple

public Result getNextTuple()
                    throws ExecException

Overrides:

getNextTuple in class PhysicalOperator

Throws:

ExecException

constructOutput

protected Tuple constructOutput(List<Result> resLst,
                                Tuple value)
                         throws ExecException

Throws:

ExecException

getKeyType

public byte getKeyType()

setKeyType

public void setKeyType(byte keyType)

getPlans

public List<PhysicalPlan> getPlans()

setPlans

public void setPlans(List<PhysicalPlan> plans)
              throws PlanException

Throws:

PlanException

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