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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