Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/14181#discussion_r70770371 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -154,8 +154,12 @@ class SimpleTestOptimizer extends Optimizer( object PushProjectThroughSample extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan transform { // Push down projection into sample - case Project(projectList, Sample(lb, up, replace, seed, child)) => - Sample(lb, up, replace, seed, Project(projectList, child))() + case proj @ Project(projectList, Sample(lb, up, replace, seed, child)) => + if (!projectList.exists(_.find(!_.deterministic).nonEmpty)) { --- End diff -- Ah, I got this. Thanks.
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