org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators
Class POMapLookUp

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.expressionOperators.ExpressionOperator
              org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POMapLookUp

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Operator>, Illustrable

public class POMapLookUp
extends ExpressionOperator

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

POMapLookUp(OperatorKey k)

POMapLookUp(OperatorKey k, int rp)

POMapLookUp(OperatorKey k, int rp, String key)

Method Summary

POMapLookUp	clone() Make a deep copy of this operator.
List<ExpressionOperator>	getChildExpressions() Get the sub-expressions of this expression.
String	getLookUpKey()
Result	getNextBoolean()
Result	getNextDataBag()
Result	getNextDataByteArray()
Result	getNextDateTime()
Result	getNextDouble()
Result	getNextFloat()
Result	getNextInteger()
Result	getNextLong()
Result	getNextMap()
Result	getNextString()
Result	getNextTuple()
Tuple	illustratorMarkup(Object in, Object out, int eqClassIndex) input tuple mark up to be illustrate-able
String	name()
Result	processInput() A generic method for parsing input that either returns the attached input if it exists or fetches it from its predecessor.
void	setLookUpKey(String key)
boolean	supportsMultipleInputs() Indicates whether this operator supports multiple inputs.
void	visit(PhyPlanVisitor v) Visit this node with the provided visitor.

Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ExpressionOperator

accumChild, containUDF, setIllustrator, supportsMultipleOutputs, toString

Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator

addOriginalLocation, addOriginalLocation, attachInput, cloneHelper, detachInput, getAlias, getAliasString, getIllustrator, getInputs, getLogger, getNext, getNextBigDecimal, getNextBigInteger, getOriginalLocations, getPigLogger, getReporter, getRequestedParallelism, getResultType, isAccumStarted, isAccumulative, isBlocking, isInputAttached, reset, setAccumEnd, setAccumStart, setAccumulative, setInputs, setParentPlan, setPigLogger, setReporter, setRequestedParallelism, setResultType

Methods inherited from class org.apache.pig.impl.plan.Operator

compareTo, equals, getOperatorKey, getProjectionMap, hashCode, regenerateProjectionMap, rewire, unsetProjectionMap

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

POMapLookUp

public POMapLookUp(OperatorKey k)

POMapLookUp

public POMapLookUp(OperatorKey k,
                   int rp)

POMapLookUp

public POMapLookUp(OperatorKey k,
                   int rp,
                   String key)

Method Detail

setLookUpKey

public void setLookUpKey(String key)

getLookUpKey

public String getLookUpKey()

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 ExpressionOperator

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.

processInput

public Result processInput()
                    throws ExecException

Description copied from class: PhysicalOperator

A generic method for parsing input that either returns the attached input if it exists or fetches it from its predecessor. If special processing is required, this method should be overridden.

Overrides:

processInput in class PhysicalOperator

Returns:

The Result object that results from processing the input

Throws:

ExecException

getNextBoolean

public Result getNextBoolean()
                      throws ExecException

Overrides:

getNextBoolean in class PhysicalOperator

Throws:

ExecException

getNextDataBag

public Result getNextDataBag()
                      throws ExecException

Overrides:

getNextDataBag in class ExpressionOperator

Throws:

ExecException

getNextDataByteArray

public Result getNextDataByteArray()
                            throws ExecException

Overrides:

getNextDataByteArray in class PhysicalOperator

Throws:

ExecException

getNextDouble

public Result getNextDouble()
                     throws ExecException

Overrides:

getNextDouble in class PhysicalOperator

Throws:

ExecException

getNextFloat

public Result getNextFloat()
                    throws ExecException

Overrides:

getNextFloat in class PhysicalOperator

Throws:

ExecException

getNextInteger

public Result getNextInteger()
                      throws ExecException

Overrides:

getNextInteger in class PhysicalOperator

Throws:

ExecException

getNextLong

public Result getNextLong()
                   throws ExecException

Overrides:

getNextLong in class PhysicalOperator

Throws:

ExecException

getNextDateTime

public Result getNextDateTime()
                       throws ExecException

Overrides:

getNextDateTime in class PhysicalOperator

Throws:

ExecException

getNextMap

public Result getNextMap()
                  throws ExecException

Overrides:

getNextMap in class PhysicalOperator

Throws:

ExecException

getNextString

public Result getNextString()
                     throws ExecException

Overrides:

getNextString in class PhysicalOperator

Throws:

ExecException

getNextTuple

public Result getNextTuple()
                    throws ExecException

Overrides:

getNextTuple in class PhysicalOperator

Throws:

ExecException

clone

public POMapLookUp clone()
                  throws CloneNotSupportedException

Description copied from class: ExpressionOperator

Make a deep copy of this operator. This is declared here to make it possible to call clone on ExpressionOperators.

Overrides:

clone in class ExpressionOperator

Throws:

CloneNotSupportedException

See Also:

Do not use the clone method directly. Operators are cloned when logical plans are cloned using {@link LogicalPlanCloner}

getChildExpressions

public List<ExpressionOperator> getChildExpressions()

Description copied from class: ExpressionOperator

Get the sub-expressions of this expression. This is called if reducer is run as accumulative mode, all the child expression must be called if they have any UDF to drive the UDF.accumulate()

Specified by:

getChildExpressions in class ExpressionOperator

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