zhengruifeng commented on a change in pull request #31468:
URL: https://github.com/apache/spark/pull/31468#discussion_r573438154
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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala
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@@ -200,28 +210,32 @@ case class TakeOrderedAndProjectExec(
protected override def doExecute(): RDD[InternalRow] = {
val ord = new LazilyGeneratedOrdering(sortOrder, child.output)
val childRDD = child.execute()
- val singlePartitionRDD = if (childRDD.getNumPartitions > 1) {
- val localTopK = childRDD.mapPartitions { iter =>
- org.apache.spark.util.collection.Utils.takeOrdered(iter.map(_.copy()),
limit)(ord)
- }
- new ShuffledRowRDD(
- ShuffleExchangeExec.prepareShuffleDependency(
- localTopK,
- child.output,
- SinglePartition,
- serializer,
- writeMetrics),
- readMetrics)
+ if (childRDD.getNumPartitions == 0) {
+ sparkContext.parallelize(Array.empty[InternalRow], 1)
Review comment:
ok, I will update it.
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