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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