Github user joseph-torres commented on a diff in the pull request: https://github.com/apache/spark/pull/18925#discussion_r132795536 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala --- @@ -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 -- The intent here is that callers who need a Deduplicate will use the two-argument form in the Object, which will then use the constructor to preserve the output mode of the child. A val defined inside the case class isn't accounted for by copy(), which caused test failures when I tried it.
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