Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/22712#discussion_r227201626 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ordering.scala --- @@ -53,6 +53,10 @@ class InterpretedOrdering(ordering: Seq[SortOrder]) extends Ordering[InternalRow a.interpretedOrdering.asInstanceOf[Ordering[Any]].compare(left, right) case a: ArrayType if order.direction == Descending => a.interpretedOrdering.asInstanceOf[Ordering[Any]].reverse.compare(left, right) + case m: MapType if m.isOrdered && order.direction == Ascending => + m.interpretedOrdering.asInstanceOf[Ordering[Any]].compare(left, right) + case m: MapType if m.isOrdered && order.direction == Descending => + m.interpretedOrdering.asInstanceOf[Ordering[Any]].reverse.compare(left, right) --- End diff -- You mean we can't remove this? If not necessary, better to remove it off.
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