dongjoon-hyun commented on a change in pull request #24049: [SPARK-27123][SQL]
Improve CollapseProject to handle projects cross limit/repartition/sample
URL: https://github.com/apache/spark/pull/24049#discussion_r265189229
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -699,6 +699,24 @@ object CollapseProject extends Rule[LogicalPlan] {
agg.copy(aggregateExpressions = buildCleanedProjectList(
p.projectList, agg.aggregateExpressions))
}
+ case p1 @ Project(_, g @ GlobalLimit(_, l @ LocalLimit(_, p2: Project))) =>
Review comment:
Thank you for review, @gatorsmile and @cloud-fan . I got it. I'll narrow
down with `if isRenaming(l1, l2) =>` for these cases, too.
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