Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21021#discussion_r184293071
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -185,6 +183,8 @@ trait ArraySortUtil extends ExpectsInputTypes with
CodegenFallback {
object ArraySortUtil {
type NullOrder = Int
+ // Least: place null element at the end of the array
+ // Greatest: place null element at the beginning of the array
--- End diff --
Can you add `for ascending order` or something?
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