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

Class ConstantExpression

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.ConstantExpression

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable<Operator>, Illustrable

public class ConstantExpression
extends ExpressionOperator

This class implements a Constant of any type. Its value can be set using the setValue method.

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, reporter, requestedParallelism, RESULT_EMPTY, RESULT_EOP, resultType

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

mKey

Constructor Summary

Constructors

Constructor and Description
ConstantExpression(OperatorKey k)
ConstantExpression(OperatorKey k, int rp)

Method Summary

Methods

Modifier and Type	Method and Description
ConstantExpression	clone() Make a deep copy of this operator.
java.util.List<ExpressionOperator>	getChildExpressions() Get the child expressions of this expression
Result	getNextBigDecimal()
Result	getNextBigInteger()
Result	getNextBoolean()
Result	getNextDataBag()
Result	getNextDataByteArray()
Result	getNextDateTime()
Result	getNextDouble()
Result	getNextFloat()
Result	getNextInteger()
Result	getNextLong()
Result	getNextMap()
Result	getNextString()
Result	getNextTuple()
java.lang.Object	getValue()
Tuple	illustratorMarkup(java.lang.Object in, java.lang.Object out, int eqClassIndex) input tuple mark up to be illustrate-able
java.lang.String	name()
void	setValue(java.lang.Object value)
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.expressionOperators.ExpressionOperator

accumChild, containUDF, setIllustrator, toString

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

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

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

ConstantExpression

public ConstantExpression(OperatorKey k)

ConstantExpression

public ConstantExpression(OperatorKey k,
                  int rp)

Method Detail

name

public java.lang.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.

Overrides:

supportsMultipleOutputs in class ExpressionOperator

Returns:

true if it does, otherwise false.

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.

getValue

public java.lang.Object getValue()

setValue

public void setValue(java.lang.Object value)

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

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

getNextBoolean

public Result getNextBoolean()
                      throws ExecException

Overrides:

getNextBoolean in class PhysicalOperator

Throws:

ExecException

getNextMap

public Result getNextMap()
                  throws ExecException

Overrides:

getNextMap in class PhysicalOperator

Throws:

ExecException

getNextBigInteger

public Result getNextBigInteger()
                         throws ExecException

Overrides:

getNextBigInteger in class PhysicalOperator

Throws:

ExecException

getNextBigDecimal

public Result getNextBigDecimal()
                         throws ExecException

Overrides:

getNextBigDecimal in class PhysicalOperator

Throws:

ExecException

clone

public ConstantExpression clone()
                         throws java.lang.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:

java.lang.CloneNotSupportedException

See Also:

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

getChildExpressions

public java.util.List<ExpressionOperator> getChildExpressions()

Get the child expressions of this expression

Specified by:

getChildExpressions in class ExpressionOperator

illustratorMarkup

public Tuple illustratorMarkup(java.lang.Object in,
                      java.lang.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