@SuppressWarnings("unchecked")
public IRelation getTailRelationView(final IPredicate pred) {
final int nsources = pred.getRelationCount();
if (nsources == 1) {
return (IRelation) resourceLocator.locate(pred.getOnlyRelationName(), getReadTimestamp());
} else if (nsources == 2) {
final IRelation<?> relation0 =
(IRelation) resourceLocator.locate(pred.getRelationName(0), readTimestamp);
final IRelation<?> relation1 =
(IRelation) resourceLocator.locate(pred.getRelationName(1), readTimestamp);
return new RelationFusedView(relation0, relation1).init();
} else {
throw new UnsupportedOperationException();
}
}
