Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22809#discussion_r228238508 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Max.scala --- @@ -57,3 +57,34 @@ case class Max(child: Expression) extends DeclarativeAggregate { override lazy val evaluateExpression: AttributeReference = max } + +abstract class AnyAggBase(arg: Expression) --- End diff -- If it's hard to decide where to put it, I think putting it in a new file can be considered.
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