Package org.apache.drill.exec.expr

Class ValueVectorReadExpression

java.lang.Object

org.apache.drill.exec.expr.ValueVectorReadExpression

All Implemented Interfaces:

Iterable<LogicalExpression>, LogicalExpression

public class ValueVectorReadExpression
extends Object
implements LogicalExpression

Wraps a value vector field to be read, providing metadata about the field. Also may contain batch naming information to which this field belongs. If such information is absent default naming will be used from mapping set during materialization.

Nested Class Summary

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

LogicalExpression.De, LogicalExpression.Se

Constructor Summary

Constructors

Constructor	Description
ValueVectorReadExpression(TypedFieldId tfId)
ValueVectorReadExpression(TypedFieldId tfId, BatchReference batchRef)

Method Summary

Modifier and Type	Method	Description
<T, V, E extends Exception> T	accept(ExprVisitor<T,V,E> visitor, V value)
BatchReference	getBatchRef()
int	getCumulativeCost()
TypedFieldId	getFieldId()
TypeProtos.MajorType	getMajorType()
ExpressionPosition	getPosition()
PathSegment	getReadPath()
int	getSelfCost()
TypedFieldId	getTypedFieldId()
boolean	hasReadPath()
boolean	isSuperReader()
Iterator<LogicalExpression>	iterator()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

ValueVectorReadExpression

public ValueVectorReadExpression(TypedFieldId tfId)

ValueVectorReadExpression

public ValueVectorReadExpression(TypedFieldId tfId,
 BatchReference batchRef)

Method Details

getBatchRef

public BatchReference getBatchRef()

hasReadPath

public boolean hasReadPath()

getReadPath

public PathSegment getReadPath()

getTypedFieldId

public TypedFieldId getTypedFieldId()

isSuperReader

public boolean isSuperReader()

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

Specified by:

accept in interface LogicalExpression

Throws:

E extends Exception

getFieldId

public TypedFieldId getFieldId()

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

toString

public String toString()

Overrides:

toString in class Object