Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21021#discussion_r184262552
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -300,6 +333,49 @@ case class Reverse(child: Expression) extends
UnaryExpression with ImplicitCastI
override def prettyName: String = "reverse"
}
+/**
+ * Sorts the input array in ascending order according to the natural
ordering of
+ * the array elements and returns it.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = """
+ _FUNC_(array) - Sorts the input array in ascending order. The elements
of the input array must
+ be orderable. Null elements will be placed at the end of the
returned array.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array('b', 'd', null, 'c', 'a'));
+ ["a","b","c","d",null]
+ """,
+ since = "2.4.0")
+// scalastyle:on line.size.limit
+case class ArraySort(child: Expression) extends UnaryExpression with
ArraySortUtil {
+
+ override def dataType: DataType = child.dataType
+ override def inputTypes: Seq[AbstractDataType] = Seq(ArrayType)
+
+ override def arrayExpression: Expression = child
+ override def nullOrder: Int = NullOrder.Least
--- End diff --
`nullOrder: NullOrder`?
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