Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21050#discussion_r195857889
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -2355,3 +2356,319 @@ case class ArrayRemove(left: Expression, right:
Expression)
override def prettyName: String = "array_remove"
}
+
+/**
+ * Removes duplicate values from the array.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(array) - Removes duplicate values from the array.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3, null, 3));
+ [1,2,3,null]
+ """, since = "2.4.0")
+case class ArrayDistinct(child: Expression)
+ extends UnaryExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(ArrayType)
+
+ override def dataType: DataType = child.dataType
+
+ lazy val elementType: DataType =
dataType.asInstanceOf[ArrayType].elementType
--- End diff --
`@transient`?
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