Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7774#discussion_r36133275
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala ---
@@ -41,9 +41,18 @@ case class Project(projectList: Seq[NamedExpression],
child: SparkPlan) extends
@transient lazy val buildProjection = newMutableProjection(projectList,
child.output)
- protected override def doExecute(): RDD[InternalRow] =
child.execute().mapPartitions { iter =>
- val reusableProjection = buildProjection()
- iter.map(reusableProjection)
+ override lazy val accumulators = Map(
+ "numRows" -> sparkContext.internalAccumulator(0L, "number of rows"))
+
+ protected override def doExecute(): RDD[InternalRow] = {
+ val numRows = accumulator[Long]("numRows")
--- End diff --
it is probably not useful actually to have numRows in project, since it is
always one-to-one. it would be more useful to have numRows from data sources.
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