Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6804#discussion_r32690645
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -178,6 +189,7 @@ public UTF8String clone() {
@Override
public int compareTo(final UTF8String other) {
+ if (other == null) return 1;
--- End diff --
I think it should be able to sort columns with `null` values. The behavior
should be compared to a database, shouldn't it?
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