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

    https://github.com/apache/spark/pull/9556#discussion_r44350703
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ---
    @@ -525,21 +526,15 @@ class Analyzer(
               case u @ UnresolvedFunction(name, children, isDistinct) =>
                 withPosition(u) {
                   registry.lookupFunction(name, children) match {
    +                // DISTINCT is not meaningful for a Max or a Min.
    +                case max: Max if isDistinct =>
    +                  AggregateExpression(max, Complete, isDistinct = false)
    +                case min: Min if isDistinct =>
    +                  AggregateExpression(min, Complete, isDistinct = false)
                     // We get an aggregate function built based on 
AggregateFunction2 interface.
                     // So, we wrap it in AggregateExpression2.
    --- End diff --
    
    This is a little out of date.


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