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

    https://github.com/apache/spark/pull/15532#discussion_r84004457
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -124,7 +124,15 @@ case class SortArray(base: Expression, ascendingOrder: 
Expression)
     
       override def checkInputDataTypes(): TypeCheckResult = base.dataType 
match {
         case ArrayType(dt, _) if RowOrdering.isOrderable(dt) =>
    -      TypeCheckResult.TypeCheckSuccess
    +      ascendingOrder match {
    +        case Literal(_: Boolean, BooleanType) =>
    +          TypeCheckResult.TypeCheckSuccess
    +        case _ =>
    +          TypeCheckResult.TypeCheckFailure(
    +            s"Sort order in second argument requires 
${BooleanType.simpleString} type as " +
    --- End diff --
    
    Even better, say "requires a boolean literal"


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