Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11953#discussion_r57423498
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -62,6 +62,7 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]]
extends TreeNode[PlanT
case _ =>
Set.empty[Expression]
}.foldLeft(Set.empty[Expression])(_ union _.toSet)
+ .union(output.filterNot(_.nullable).map(IsNotNull).toSet)
--- End diff --
can we break chains like this down with intermediate variables and
comments? they are becoming fairly difficult to understand.
Also the foldLeft/union ... seems like a pretty inefficient way to run this.
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