Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18993#discussion_r133971618
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1180,6 +1180,9 @@ object ConvertToLocalRelation extends
Rule[LogicalPlan] {
val projection = new InterpretedProjection(projectList, output)
projection.initialize(0)
LocalRelation(projectList.map(_.toAttribute), data.map(projection))
+
+ case Limit(IntegerLiteral(limit), LocalRelation(output, data)) =>
--- End diff --
technically this is not about correctness, `An action on a Command should
not trigger a Spark job` is also kind of optimization.
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