panbingkun commented on code in PR #37941:
URL: https://github.com/apache/spark/pull/37941#discussion_r978415199
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -830,6 +831,21 @@ object PushProjectionThroughUnion extends
Rule[LogicalPlan] {
}
}
+/**
+ * Pushes Project operator to Limit operator.
+ */
+object PushProjectionThroughLimit extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan.transformWithPruning(
+ _.containsAllPatterns(PROJECT, LIMIT)) {
+
+ // Push down deterministic projection through Limit
+ case Project(projectList, limit @ Limit(l, child))
+ if projectList.forall(_.deterministic) =>
+ val newChild = Project(projectList, child)
+ limit.copy(child = LocalLimit(l, newChild))
Review Comment:
OK
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