Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20858#discussion_r176901542
  
    --- 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]
    +  """)
    +case class ConcatArrays(children: Seq[Expression]) extends Expression with 
NullSafeEvaluation {
    +
    +  override def checkInputDataTypes(): TypeCheckResult = {
    +    val arrayCheck = checkInputDataTypesAreArrays
    +    if(arrayCheck.isFailure) arrayCheck
    --- End diff --
    
    Style issue:
    ```scala
    if (...) {
      ...
    } else {
      ...
    }
    ```


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