Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/13161#discussion_r66682082
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
---
@@ -93,6 +94,14 @@ public int compare(RecordPointerAndKeyPrefix r1,
RecordPointerAndKeyPrefix r2) {
private int pos = 0;
/**
+ * If sorting with radix sort, specifies the starting position in the
sort buffer where records
+ * with non-null prefixes are kept. Positions [0..nullPos) will contain
null-prefixed records,
+ * and positions [nullPos..pos) non-null prefixed records. This lets us
avoid radix sorting
+ * over null values.
+ */
+ private int nullPos = 0;
--- End diff --
Done
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