org.apache.tajo.plan.expr

Class EvalNode

java.lang.Object

org.apache.tajo.plan.expr.EvalNode

All Implemented Interfaces:

Cloneable, ProtoObject<PlanProto.EvalNodeTree>, GsonObject

Direct Known Subclasses:

BetweenPredicateEval, BinaryEval, CaseWhenEval, CaseWhenEval.IfThenEval, ConstEval, FieldEval, FunctionEval, RowConstantEval, UnaryEval

public abstract class EvalNode
extends Object
implements Cloneable, GsonObject, ProtoObject<PlanProto.EvalNodeTree>

An annotated expression which includes actual data domains. It is also used for evaluation.

Field Summary

Fields

Modifier and Type	Field and Description
protected EvalType	type

Constructor Summary

Constructors

Constructor and Description
EvalNode()
EvalNode(EvalType type)

Method Summary

Methods

Modifier and Type	Method and Description
abstract int	childNum()
Object	clone()
abstract <T extends Datum> T	eval(Schema schema, Tuple tuple)
abstract EvalNode	getChild(int idx)
abstract String	getName()
PlanProto.EvalNodeTree	getProto()
EvalType	getType()
abstract TajoDataTypes.DataType	getValueType()
abstract void	postOrder(EvalNodeVisitor visitor) Deprecated.
abstract void	preOrder(EvalNodeVisitor visitor) Deprecated.
String	toJson()

Methods inherited from class java.lang.Object

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

Field Detail

type

protected EvalType type

Constructor Detail

EvalNode

public EvalNode()

EvalNode

public EvalNode(EvalType type)

Method Detail

getType

public EvalType getType()

getValueType

public abstract TajoDataTypes.DataType getValueType()

childNum

public abstract int childNum()

getChild

public abstract EvalNode getChild(int idx)

getName

public abstract String getName()

toJson

public String toJson()

Specified by:

toJson in interface GsonObject

eval

public abstract <T extends Datum> T eval(Schema schema,
                       Tuple tuple)

preOrder

@Deprecated
public abstract void preOrder(EvalNodeVisitor visitor)

Deprecated.

postOrder

@Deprecated
public abstract void postOrder(EvalNodeVisitor visitor)

Deprecated.

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

getProto

public PlanProto.EvalNodeTree getProto()

Specified by:

getProto in interface ProtoObject<PlanProto.EvalNodeTree>