@Override
public Row peek() {
if (!hasPeeked) {
peekedElement = new RowN(iterator.next().materialize());
hasPeeked = true;
}
return peekedElement;
}
@Override
public Row next() {
if (!hasPeeked) {
return iterator.next();
}
Row result = peekedElement;
hasPeeked = false;
peekedElement = null;
return result;
}
