[GitHub] dongjoon-hyun commented on a change in pull request #23328: [SPARK-26327][SQL][FOLLOW-UP] Refactor the code and restore the metrics name

[GitBox <gi...@apache.org>]

dongjoon-hyun commented on a change in pull request #23328: [SPARK-26327][SQL][FOLLOW-UP] Refactor the code and restore the metrics name
URL: https://github.com/apache/spark/pull/23328#discussion_r242007662
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
 ##########
 @@ -167,14 +167,26 @@ case class FileSourceScanExec(
       partitionSchema = relation.partitionSchema,
       relation.sparkSession.sessionState.conf)
 
-  private var fileListingTime = 0L
+  val driverMetrics: HashMap[String, Long] = HashMap.empty
+
+  /**
+   * Send the driver-side metrics. Before calling this function, selectedPartitions has
+   * been initialized. See SPARK-26327 for more details.
+   */
+  private def sendDriverMetrics(): Unit = {
+    driverMetrics.foreach(e => metrics(e._1).add(e._2))
+    val executionId = sparkContext.getLocalProperty(SQLExecution.EXECUTION_ID_KEY)
+    SQLMetrics.postDriverMetricUpdates(sparkContext, executionId,
+      metrics.filter(e => driverMetrics.contains(e._1)).values.toSeq)
+  }
 
   @transient private lazy val selectedPartitions: Seq[PartitionDirectory] = {
     val optimizerMetadataTimeNs = relation.location.metadataOpsTimeNs.getOrElse(0L)
     val startTime = System.nanoTime()
     val ret = relation.location.listFiles(partitionFilters, dataFilters)
+    driverMetrics("filesNum") = ret.map(_.files.size.toLong).sum
 
 Review comment:
   Hi, @gatorsmile . It looks like a typo of `numFiles`.

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