/**
* Empty the buffer, then the iterator, without worrying about mode/state.
*
* @return
*/
public FetchSetDatum drain() {
if (!_queue.isEmpty()) {
return removeFromQueue();
} else if (safeHasNext()) {
return new FetchSetDatum(new TupleEntry(_values.next()));
} else {
return null;
}
}
public boolean isEmpty() {
return _queue.isEmpty() && !safeHasNext();
}