Github user holdenk commented on a diff in the pull request: https://github.com/apache/spark/pull/9385#discussion_r43608157 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1019,7 +1019,16 @@ class Analyzer( * scoping information for attributes and can be removed once analysis is complete. */ object EliminateSubQueries extends Rule[LogicalPlan] { - def apply(plan: LogicalPlan): LogicalPlan = plan transform { + def apply(plan: LogicalPlan): LogicalPlan = plan transformDown { + case Project(projectList, child: Subquery) => { + Project( + projectList.flatMap { --- End diff -- Could we simplify this to a map and remove the :: Nil we have in the two sub cases? since it seems we are always returning a single element list for every case so it
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