Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/14181#discussion_r75448687
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -148,6 +148,21 @@ class SimpleTestOptimizer extends Optimizer(
new SimpleCatalystConf(caseSensitiveAnalysis = true))
/**
+ * Pushes projects down beneath Sample to enable column pruning with
sampling.
+ */
+object PushProjectThroughSample extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ // Push down projection into sample
+ case proj @ Project(projectList, Sample(lb, up, replace, seed, child))
=>
+ if (!replace ||
!projectList.exists(_.find(!_.deterministic).nonEmpty)) {
--- End diff --
yea, thanks! I'll fix this.
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