Class ProjectedMappingRelation

java.lang.Object

se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

se.liu.ida.hefquin.mappings.algebra.exec.ProjectedMappingRelation

All Implemented Interfaces:

MappingRelation

public class ProjectedMappingRelation
extends BaseForMappingRelationImpl

A MappingRelation produced by a MappingOpProject operator.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	ProjectedMappingRelation.MyCursor

Field Summary

Fields

Modifier and Type	Field	Description
protected final MappingRelation	input
protected final int[]	schemaMapping	For the i-th attribute of the output schema, the integer at the i-th index in this array is the index at which the attribute can be found in the schema of the input relation.

Fields inherited from class se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

schema

Fields inherited from interface se.liu.ida.hefquin.mappings.algebra.MappingRelation

errorNode, gAttr, oAttr, pAttr, sAttr, spogAttrs

Constructor Summary

Constructors

Constructor	Description
ProjectedMappingRelation(Set<String> P, MappingRelation input)

Method Summary

Modifier and Type	Method	Description
MappingRelationCursor	getCursor()

Methods inherited from class se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

getSchema

Methods inherited from class java.lang.Object

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

Field Details

input

protected final MappingRelation input

schemaMapping

protected final int[] schemaMapping

For the i-th attribute of the output schema, the integer at the i-th index in this array is the index at which the attribute can be found in the schema of the input relation.

Constructor Details

ProjectedMappingRelation

public ProjectedMappingRelation(Set<String> P,
 MappingRelation input)

Method Details

getCursor

public MappingRelationCursor getCursor()