Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/22044#discussion_r208862917
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -3410,6 +3410,28 @@ case class ArrayDistinct(child: Expression)
case _ => false
}
+ @transient protected lazy val canUseSpecializedHashSet = elementType
match {
--- End diff --
We can do so. To minimize the changes due to remaining time for cutting, I
would like to do this in another PR #21912.
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