Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/15596#discussion_r84815874
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala ---
@@ -36,14 +36,15 @@ import org.apache.spark.util.Utils
case class CollectLimitExec(limit: Int, child: SparkPlan) extends
UnaryExecNode {
override def output: Seq[Attribute] = child.output
override def outputPartitioning: Partitioning = SinglePartition
- override def executeCollect(): Array[InternalRow] =
child.executeTake(limit)
- private val serializer: Serializer = new
UnsafeRowSerializer(child.output.size)
+ override def requiredChildDistribution: List[Distribution] = AllTuples
:: Nil
+ override def executeCollect(): Array[InternalRow] = {
+ child.collect {
--- End diff --
That seems a good idea. I once thought about the difference between
`GlobalLimitExec` and `CollectLimitExec` during refactoring this. But decided
not to change too much. Looks like I could remove `CollectLimitExec`.
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