Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21061#discussion_r182672237
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -505,3 +506,150 @@ case class ArrayMax(child: Expression) extends
UnaryExpression with ImplicitCast
override def prettyName: String = "array_max"
}
+
+abstract class ArraySetUtils extends BinaryExpression with
ExpectsInputTypes {
+ val kindUnion = 1
--- End diff --
This should be in `ArraySetUtils` object?
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