Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r78269936
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java
---
@@ -69,48 +86,96 @@ public static long computePrefix(double value) {
* ordering they define is compatible with radix sort.
*/
public abstract static class RadixSortSupport extends PrefixComparator {
+
/** @return Whether the sort should be descending in binary sort
order. */
public abstract boolean sortDescending();
/** @return Whether the sort should take into account the sign bit. */
public abstract boolean sortSigned();
+
+ /** @return Whether the sort should put null first or last. */
+ public abstract boolean nullFirst();
--- End diff --
nit: "nullsFirst"?
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