huaxingao commented on a change in pull request #34291:
URL: https://github.com/apache/spark/pull/34291#discussion_r732435304
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/V2ScanRelationPushDown.scala
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@@ -225,6 +225,30 @@ object V2ScanRelationPushDown extends Rule[LogicalPlan]
with PredicateHelper {
withProjection
}
+ def applyLimit(plan: LogicalPlan): LogicalPlan = plan.transform {
+ case globalLimit @ GlobalLimit(_,
+ LocalLimit(limitExpr, DataSourceV2ScanRelation(_, scan, _))) =>
+ val supportsPushDownLimit = scan match {
+ case _: SupportsPushDownLimit => true
+ case v1: V1ScanWrapper =>
+ v1.v1Scan match {
+ case _: SupportsPushDownLimit => true
+ case _ => false
+ }
+ case _ => false
+ }
+ if (supportsPushDownLimit) {
+ assert(limitExpr.isInstanceOf[Literal] &&
+ limitExpr.asInstanceOf[Literal].value.isInstanceOf[Integer],
+ "Limit has to be an Integer")
+ val value = limitExpr.asInstanceOf[Literal].value.asInstanceOf[Integer]
+ PushDownUtils.pushLimit(scan, value)
+ globalLimit
+ } else {
+ globalLimit
+ }
Review comment:
Thanks! much neater now.
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