Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/12599#discussion_r60696638 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala --- @@ -83,6 +83,16 @@ case class SerializeFromObject( child: LogicalPlan) extends UnaryNode with ObjectConsumer { override def output: Seq[Attribute] = serializer.map(_.toAttribute) + + // We can't estimate the size of ObjectType. We implement statistics here to avoid + // directly estimate any child plan which produces domain objects as output. + override def statistics: Statistics = { + if (child.output.find(_.dataType.isInstanceOf[ObjectType]).isDefined) { --- End diff -- nit: we can just do `child.output.head.isInstanceOf[ObjectType]`, this is guarantted in: ``` trait ObjectConsumer extends UnaryNode { assert(child.output.length == 1) ... ```
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