Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/11599#discussion_r55482082 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -380,6 +380,9 @@ object ColumnPruning extends Rule[LogicalPlan] { p } + // Eliminate the Projects with empty projectList + case p @ Project(projectList, child) if projectList.isEmpty => child --- End diff -- Thanks @viirya @cloud-fan ! I am not sure which way is better. ```scala case p @ Project(_, l: LeafNode) if !l.isInstanceOf[OneRowRelation] => p ``` My concern is the above line looks more hacky than the current PR fix.
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