Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/21061#discussion_r182971159 --- 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 -- sure
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