cloud-fan 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_r265206012
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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:
I believe case 1 can be handled with `isRenaming`, but I'm not sure how case
2 can be handled.
Case 2 actually means that we can't push down project through operators that
will reduce the numRows, e.g. limit, sample, etc.
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