Github user xwu0226 commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r77372825
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
---
@@ -333,11 +333,12 @@ public UnsafeSorterIterator getSortedIterator() {
if (nullBoundaryPos > 0) {
assert radixSortSupport != null : "Nulls are only stored separately
with radix sort";
LinkedList<UnsafeSorterIterator> queue = new LinkedList<>();
- if (radixSortSupport.sortDescending()) {
- // Nulls are smaller than non-nulls
+
+ // The null order is either LAST or FIRST, regardless of sorting
direction (ASC|DESC)
+ if (radixSortSupport.nullOrder() == PrefixComparator.NullOrder.LAST)
{
queue.add(new SortedIterator((pos - nullBoundaryPos) / 2, offset));
queue.add(new SortedIterator(nullBoundaryPos / 2, 0));
- } else {
+ } else if (radixSortSupport.nullOrder() ==
PrefixComparator.NullOrder.FIRST) {
queue.add(new SortedIterator(nullBoundaryPos / 2, 0));
queue.add(new SortedIterator((pos - nullBoundaryPos) / 2, offset));
}
--- End diff --
Thank you for the advice! Yep. Your way works as expected. I am going to
push soon after the full test.
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