mbutrovich commented on code in PR #3842:
URL: https://github.com/apache/datafusion-comet/pull/3842#discussion_r3017876444
##########
spark/src/test/scala/org/apache/spark/sql/comet/CometTaskMetricsSuite.scala:
##########
@@ -91,4 +94,66 @@ class CometTaskMetricsSuite extends CometTestBase with
AdaptiveSparkPlanHelper {
}
}
}
+
+ test("native_datafusion scan reports task-level input metrics matching
Spark") {
+ withParquetTable((0 until 10000).map(i => (i, (i + 1).toLong)), "tbl") {
+ // Collect baseline input metrics from vanilla Spark (Comet disabled)
+ val (sparkBytes, sparkRecords) =
collectInputMetrics(CometConf.COMET_ENABLED.key -> "false")
+
+ // Collect input metrics from Comet native_datafusion scan
+ val (cometBytes, cometRecords) = collectInputMetrics(
+ CometConf.COMET_NATIVE_SCAN_IMPL.key ->
CometConf.SCAN_NATIVE_DATAFUSION)
+
+ // Records must match exactly
+ assert(
+ cometRecords == sparkRecords,
+ s"recordsRead mismatch: comet=$cometRecords, spark=$sparkRecords")
+
+ // Bytes should be in the same ballpark -- both read the same Parquet
file(s),
+ // but the exact byte count can differ due to reader implementation
details
+ // (e.g. footer reads, page headers, buffering granularity).
+ assert(sparkBytes > 0, s"Spark bytesRead should be > 0, got $sparkBytes")
+ assert(cometBytes > 0, s"Comet bytesRead should be > 0, got $cometBytes")
+ val ratio = cometBytes.toDouble / sparkBytes.toDouble
+ assert(
+ ratio >= 0.8 && ratio <= 1.2,
+ s"bytesRead ratio out of range: comet=$cometBytes, spark=$sparkBytes,
ratio=$ratio")
+ }
+ }
+
+ /**
+ * Runs `SELECT * FROM tbl` with the given SQL config overrides and returns
the aggregated
+ * (bytesRead, recordsRead) across all tasks.
+ */
+ private def collectInputMetrics(confs: (String, String)*): (Long, Long) = {
+ val inputMetricsList = mutable.ArrayBuffer.empty[InputMetrics]
+
+ val listener = new SparkListener {
+ override def onTaskEnd(taskEnd: SparkListenerTaskEnd): Unit = {
+ val im = taskEnd.taskMetrics.inputMetrics
+ inputMetricsList.synchronized {
+ inputMetricsList += im
+ }
+ }
+ }
+
+ spark.sparkContext.addSparkListener(listener)
+ try {
+ // Drain any earlier events
+ spark.sparkContext.listenerBus.waitUntilEmpty()
+
+ withSQLConf(confs: _*) {
+ sql("SELECT * FROM tbl").collect()
Review Comment:
A filter would show the discrepancy/incorrect values when scan isn't the
first child node.
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