Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/11210#discussion_r53837992
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -521,9 +540,7 @@ case class Expand(
AttributeSet(projections.flatten.flatMap(_.references))
override def statistics: Statistics = {
- // TODO shouldn't we factor in the size of the projection versus the
size of the backing child
- // row?
- val sizeInBytes = child.statistics.sizeInBytes * projections.length
+ val sizeInBytes = super.statistics.sizeInBytes * projections.length
--- End diff --
Is this right? This assumes each projection is the identity right?
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