Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/21189#discussion_r185043356 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/SizeInBytesOnlyStatsPlanVisitor.scala --- @@ -33,8 +33,8 @@ object SizeInBytesOnlyStatsPlanVisitor extends LogicalPlanVisitor[Statistics] { private def visitUnaryNode(p: UnaryNode): Statistics = { // There should be some overhead in Row object, the size should not be zero when there is // no columns, this help to prevent divide-by-zero error. - val childRowSize = p.child.output.map(_.dataType.defaultSize).sum + 8 - val outputRowSize = p.output.map(_.dataType.defaultSize).sum + 8 + val childRowSize = EstimationUtils.getSizePerRow(p.child.output) + val outputRowSize = EstimationUtils.getSizePerRow(p.output) --- End diff -- cc @juliuszsompolski @cloud-fan
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