Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/20938#discussion_r181456547
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -287,3 +289,160 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+
+/**
+ * Transforms an array of arrays into a single array.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(arrayOfArrays) - Transforms an array of arrays into a
single array.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(array(1, 2), array(3, 4));
+ [1,2,3,4]
+ """,
+ since = "2.4.0")
+case class Flatten(child: Expression) extends UnaryExpression {
+
+ override def nullable: Boolean = child.nullable || dataType.containsNull
--- End diff --
Good spot!
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