Github user rxin commented on a diff in the pull request:
    --- Diff: 
    @@ -124,7 +124,15 @@ case class SortArray(base: Expression, ascendingOrder: 
       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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