Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r176901989
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -287,3 +289,152 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+
+/**
+ * Concatenates multiple arrays into one.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(expr, ...) - Concatenates multiple arrays into one.",
--- End diff --
Defines that the element types of the arrays must be the same.
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