Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11995#discussion_r58259989
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -527,6 +526,8 @@ case class Expand(
val sizeInBytes = super.statistics.sizeInBytes * projections.length
Statistics(sizeInBytes = sizeInBytes)
}
+
+ override protected def validConstraints: Set[Expression] =
Set.empty[Expression]
--- End diff --
I'm also going to add a comment here to explain why this is empty.
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