Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/14327#discussion_r72009385
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -150,11 +150,13 @@ class SimpleTestOptimizer extends Optimizer(
/**
* Pushes projects down beneath Sample to enable column pruning with
sampling.
+ * This rule is only doable when the projects don't add new attributes.
*/
object PushProjectThroughSample extends Rule[LogicalPlan] {
--- End diff --
yah. I will update this. At least one optimizer test uses this rule. The
test should be changed too.
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