maropu commented on a change in pull request #24765: [SPARK-27915][SQL][WIP]
Update logical Filter's output nullability based on IsNotNull conditions
URL: https://github.com/apache/spark/pull/24765#discussion_r303719053
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
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@@ -51,7 +51,14 @@ case class Subquery(child: LogicalPlan) extends
OrderPreservingUnaryNode {
case class Project(projectList: Seq[NamedExpression], child: LogicalPlan)
extends OrderPreservingUnaryNode {
- override def output: Seq[Attribute] = projectList.map(_.toAttribute)
+ override def output: Seq[Attribute] = {
+ // The child operator may have inferred more precise nullability
information
+ // for the project expression, so leverage that information if it's
availble:
+ val childOutputNullability = child.output.map(a => a.exprId ->
a.nullable).toMap
+ projectList
+ .map(_.toAttribute)
+ .map{ a =>
childOutputNullability.get(a.exprId).map(a.withNullability).getOrElse(a) }
Review comment:
We need to fix this part? It seems `UpdateAttributeNullability` could handle
this case if `Filter.output` works well?
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