org.apache.tajo.plan

Class Target

java.lang.Object

org.apache.tajo.plan.Target

All Implemented Interfaces:

Cloneable, ProtoObject<PlanProto.Target>, GsonObject

public class Target
extends Object
implements Cloneable, GsonObject, ProtoObject<PlanProto.Target>

A Target contains how to evaluate an expression and its alias name.

Constructor Summary

Constructors

Constructor and Description
Target(EvalNode eval, String alias)
Target(FieldEval fieldEval)

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone()
boolean	equals(Object obj)
String	getAlias()
String	getCanonicalName()
TajoDataTypes.DataType	getDataType()
<T extends EvalNode> T	getEvalTree()
Column	getNamedColumn()
PlanProto.Target	getProto()
boolean	hasAlias()
int	hashCode()
void	setAlias(String alias)
void	setExpr(EvalNode expr)
String	toJson()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Target

public Target(FieldEval fieldEval)

Target

public Target(EvalNode eval,
      String alias)

Method Detail

getCanonicalName

public String getCanonicalName()

setExpr

public final void setExpr(EvalNode expr)

setAlias

public final void setAlias(String alias)

getAlias

public final String getAlias()

hasAlias

public final boolean hasAlias()

getDataType

public TajoDataTypes.DataType getDataType()

getEvalTree

public <T extends EvalNode> T getEvalTree()

getNamedColumn

public Column getNamedColumn()

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

toJson

public String toJson()

Specified by:

toJson in interface GsonObject

getProto

public PlanProto.Target getProto()

Specified by:

getProto in interface ProtoObject<PlanProto.Target>