fCurrentSubIterator
if (!fCurrentSubIterator)
fCurrentSubIterator = subIterator;
if (fCurrentSubIterator == subIterator)
return fCurrentSubIterator;
if (fCurrentSubIterator)
fCurrentSubIterator = fSubIterators.GetNext(fCurrentSubIterator);
return fCurrentSubIterator;
fCurrentSubIterator = fSubIterators.First();
QueryIterator* fCurrentSubIterator;