org.apache.drill.common.expression

Class NullExpression

java.lang.Object

org.apache.drill.common.expression.NullExpression

All Implemented Interfaces:

Iterable<LogicalExpression>, LogicalExpression

public class NullExpression
extends Object
implements LogicalExpression

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.common.expression.LogicalExpression

LogicalExpression.De, LogicalExpression.Se

Field Summary

Fields

Modifier and Type	Field and Description
static NullExpression	INSTANCE

Constructor Summary

Constructors

Constructor and Description
NullExpression()

Method Summary

Modifier and Type	Method and Description
<T,V,E extends Exception> T	accept(ExprVisitor<T,V,E> visitor, V value)
int	getCumulativeCost()
TypeProtos.MajorType	getMajorType()
ExpressionPosition	getPosition()
int	getSelfCost()
Iterator<LogicalExpression>	iterator()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

INSTANCE

public static final NullExpression INSTANCE

Constructor Detail

NullExpression

public NullExpression()

Method Detail

getMajorType

public TypeProtos.MajorType getMajorType()

Specified by:

getMajorType in interface LogicalExpression

accept

public <T,V,E extends Exception> T accept(ExprVisitor<T,V,E> visitor,
                                          V value)
                                   throws E extends Exception

Specified by:

accept in interface LogicalExpression

Throws:

E extends Exception

getPosition

public ExpressionPosition getPosition()

Specified by:

getPosition in interface LogicalExpression

iterator

public Iterator<LogicalExpression> iterator()

Specified by:

iterator in interface Iterable<LogicalExpression>

getSelfCost

public int getSelfCost()

Specified by:

getSelfCost in interface LogicalExpression

getCumulativeCost

public int getCumulativeCost()

Specified by:

getCumulativeCost in interface LogicalExpression