cloud-fan commented on a change in pull request #34291:
URL: https://github.com/apache/spark/pull/34291#discussion_r733398430
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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 +225,38 @@ object V2ScanRelationPushDown extends Rule[LogicalPlan]
with PredicateHelper {
withProjection
}
+ def applyLimit(plan: LogicalPlan): LogicalPlan = plan.transform {
+ case globalLimit @ Limit(IntegerLiteral(limitValue), child) => child match
{
+ case DataSourceV2ScanRelation(_, scan, _) =>
+ pushDownLimit(globalLimit, scan, limitValue)
+ case Project(_, DataSourceV2ScanRelation(_, scan, _)) =>
+ pushDownLimit (globalLimit, scan, limitValue)
+ case Aggregate(_, _, DataSourceV2ScanRelation(_, scan, _))
Review comment:
is it correct to push limit through aggregate?
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