Github user marmbrus commented on a diff in the pull request:
    --- Diff: 
    @@ -779,10 +780,16 @@ case object OneRowRelation extends LeafNode {
     /** A logical plan for `dropDuplicates`. */
    +case object Deduplicate {
    +  def apply(keys: Seq[Attribute], child: LogicalPlan): Deduplicate = {
    +    Deduplicate(keys, child, child.outputMode)
    +  }
     case class Deduplicate(
         keys: Seq[Attribute],
         child: LogicalPlan,
    -    streaming: Boolean) extends UnaryNode {
    +    originalOutputMode: OutputMode) extends UnaryNode {
    --- End diff --
    Can we drop this?  Can it just preserve the output mode of its child?

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