public UnsafeSorterIterator getSortedIterator() throws IOException {
final UnsafeSorterIterator inMemoryIterator = sorter.getSortedIterator();
int numIteratorsToMerge = spillWriters.size() + (inMemoryIterator.hasNext() ? 1 : 0);
if (spillWriters.isEmpty()) {
return inMemoryIterator;
} else {
final UnsafeSorterSpillMerger spillMerger =
new UnsafeSorterSpillMerger(recordComparator, prefixComparator, numIteratorsToMerge);
for (UnsafeSorterSpillWriter spillWriter : spillWriters) {
spillMerger.addSpill(spillWriter.getReader(blockManager));
}
spillWriters.clear();
if (inMemoryIterator.hasNext()) {
spillMerger.addSpill(inMemoryIterator);
}
return spillMerger.getSortedIterator();
}
}
