Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18020#discussion_r117116968 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala --- @@ -82,10 +82,10 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]] extends TreeNode[PlanT } // Collect aliases from expressions, so we may avoid producing recursive constraints. - private lazy val aliasMap = AttributeMap( - (expressions ++ children.flatMap(_.expressions)).collect { + protected lazy val aliasMap: AttributeMap[Expression] = AttributeMap( --- End diff -- `protected`?
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