cloud-fan commented on a change in pull request #34738:
URL: https://github.com/apache/spark/pull/34738#discussion_r767463374
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/V2ScanRelationPushDown.scala
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@@ -246,16 +247,42 @@ object V2ScanRelationPushDown extends Rule[LogicalPlan]
with PredicateHelper {
}
}
+ private def pushDownLimit(plan: LogicalPlan, limit: Int): LogicalPlan = plan
match {
+ case operation @ ScanOperation(_, filter, sHolder: ScanBuilderHolder) if
filter.isEmpty =>
+ val limitPushed = PushDownUtils.pushLimit(sHolder.builder, limit)
+ if (limitPushed) {
+ sHolder.pushedLimit = Some(limit)
+ }
+ operation
+ case s @ Sort(order, _, operation @ ScanOperation(_, filter, sHolder:
ScanBuilderHolder))
+ if filter.isEmpty =>
+ val orders = DataSourceStrategy.translateSortOrders(order)
+ val topNPushed = PushDownUtils.pushTopN(sHolder.builder, orders.toArray,
limit)
+ if (topNPushed) {
+ sHolder.pushedLimit = Some(limit)
+ sHolder.sortValues = orders
+ operation
+ } else {
+ s
+ }
+ case p: Project =>
+ val newChild = pushDownLimit(p.child, limit)
+ if (newChild == p.child) {
Review comment:
we can call `p.withNewChildren(Seq(newChild))`, which does this check
for you.
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