be.SIRAPRISE.ra

Class ExtendProxy

java.lang.Object

be.SIRAPRISE.ra.RelationProxy

be.SIRAPRISE.ra.ExtendProxy

All Implemented Interfaces:

IRelation

public class ExtendProxy
extends RelationProxy

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
ExtendProxy(RelationProxy extendInput, java.util.Map<NameIdentifier,java.lang.String> extendExpressions)

Method Summary

Modifier and Type	Method and Description
java.lang.String	getHostExpressionEvaluationText() Gets The expression text for the expression to be evaluated by the host

Methods inherited from class be.SIRAPRISE.ra.RelationProxy

aggregate, dividedyper, extend, getHost, getRelationBuffer, group, gtclose, intersect, intersectUsing, isProxy, join, joinUsing, leftJoin, leftJoinUsing, minus, minusUsing, pack, project, rename, restrict, semijoin, semijoinUsing, semiminus, semiminusUsing, summarizeby, tclose, transform, ungroup, union, unionUsing, unpack, xminus, xminusUsing

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtendProxy

public ExtendProxy(RelationProxy extendInput,
                   java.util.Map<NameIdentifier,java.lang.String> extendExpressions)

Parameters:

extendInput - proxy for the relation to be extended according to the specs in extendExpressions

extendExpressions - the Map holding the extend specs. Key in the map is the attribute name for extend results in the resulting relation, Value in the map is the expression text for computing the value for each tuple

Method Detail

getHostExpressionEvaluationText

public java.lang.String getHostExpressionEvaluationText()

Description copied from interface: IRelation

Gets The expression text for the expression to be evaluated by the host

Specified by:

getHostExpressionEvaluationText in interface IRelation

Specified by:

getHostExpressionEvaluationText in class RelationProxy

Returns:

The expression text for the expression to be sent to the host for evaluation