Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/20858#discussion_r177003161 --- 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.", + examples = """ + Examples: + > SELECT _FUNC_(array(1, 2, 3), array(4, 5), array(6)); + [1,2,3,4,5,6] + """) --- End diff -- Shall we add `since` too? ``` ... [1,2,3,4,5,6] """, since = "2.4.0") ```
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