Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/10285#discussion_r47465230 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala --- @@ -263,6 +265,10 @@ case class Except(left: SparkPlan, right: SparkPlan) extends BinaryNode { protected override def doExecute(): RDD[InternalRow] = { left.execute().map(_.copy()).subtract(right.execute().map(_.copy())) } + + override def outputsUnsafeRows: Boolean = children.forall(_.outputsUnsafeRows) + override def canProcessUnsafeRows: Boolean = true --- End diff -- seems it's already promised in https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/rowFormatConverters.scala#L95-L106
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