SortedKeyValueIterator<Key,Value> iter;
if (options.isolated) {
if (isolatedIter == null)
isolatedIter = new SourceSwitchingIterator(dataSource, true);
else
isolatedDataSource.fileManager.reattach();
iter = isolatedIter;
} else {
iter = new SourceSwitchingIterator(dataSource, false);
}
results = nextBatch(iter, range, options.num, options.columnSet);
if (results.results == null) {