Copilot commented on code in PR #13116:
URL: https://github.com/apache/gluten/pull/13116#discussion_r4091556597


##########
backends-bolt/src/main/scala/org/apache/gluten/backendsapi/bolt/BoltMetricsApi.scala:
##########
@@ -543,6 +543,22 @@ class BoltMetricsApi extends MetricsApi with Logging {
   override def genSortTransformerMetricsUpdater(metrics: Map[String, 
SQLMetric]): MetricsUpdater =
     new SortMetricsUpdater(metrics)
 
+  override def genTopNTransformerMetrics(sparkContext: SparkContext): 
Map[String, SQLMetric] =
+    Map(
+      "numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of 
output rows"),
+      "outputVectors" -> SQLMetrics.createMetric(sparkContext, "number of 
output vectors"),
+      "outputBytes" -> SQLMetrics.createSizeMetric(sparkContext, "number of 
output bytes"),

Review Comment:
   The new regression test exercises only the Velox implementation, while this 
patch also adds independent Bolt TopN lowering and metric wiring. A failure in 
Bolt's updater or metric attachment would therefore pass the current tests; add 
the equivalent assertion to `BoltMetricsSuite` (and keep it under the 
repository's unit-test coverage).



##########
backends-bolt/src/main/scala/org/apache/gluten/metrics/TopNMetricsUpdater.scala:
##########
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gluten.metrics
+
+import org.apache.spark.sql.execution.metric.SQLMetric
+
+// Bolt lowers TopN to a bounded-heap `TopNNode`, which never spills. Hence, 
unlike
+// SortMetricsUpdater, no spill-related metrics are collected here.
+class TopNMetricsUpdater(val metrics: Map[String, SQLMetric]) extends 
MetricsUpdater {
+
+  override def updateNativeMetrics(opMetrics: IOperatorMetrics): Unit = {
+    if (opMetrics != null) {
+      val operatorMetrics = opMetrics.asInstanceOf[OperatorMetrics]
+      metrics("numOutputRows") += operatorMetrics.outputRows
+      metrics("outputVectors") += operatorMetrics.outputVectors
+      metrics("outputBytes") += operatorMetrics.outputBytes
+      metrics("cpuCount") += operatorMetrics.cpuCount
+      metrics("wallNanos") += operatorMetrics.wallNanos

Review Comment:
   This updater drops `operatorMetrics.loadLazyVectorTime`, and the 
corresponding metric is also absent from `genTopNTransformerMetrics`. The Bolt 
native metrics already expose this field for other operators, so TopN silently 
loses it; add the metric to the map and update it here to preserve the stated 
parity with `LimitMetricsUpdater`.



##########
backends-velox/src/main/scala/org/apache/gluten/metrics/TopNMetricsUpdater.scala:
##########
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gluten.metrics
+
+import org.apache.spark.sql.execution.metric.SQLMetric
+
+// Velox lowers TopN to a bounded-heap `TopNNode`, which never spills. Hence, 
unlike
+// SortMetricsUpdater, no spill-related metrics are collected here.
+class TopNMetricsUpdater(val metrics: Map[String, SQLMetric]) extends 
MetricsUpdater {
+
+  override def updateNativeMetrics(opMetrics: IOperatorMetrics): Unit = {
+    if (opMetrics != null) {
+      val operatorMetrics = opMetrics.asInstanceOf[OperatorMetrics]
+      metrics("numOutputRows") += operatorMetrics.outputRows
+      metrics("outputVectors") += operatorMetrics.outputVectors
+      metrics("outputBytes") += operatorMetrics.outputBytes
+      metrics("cpuCount") += operatorMetrics.cpuCount
+      metrics("wallNanos") += operatorMetrics.wallNanos

Review Comment:
   This updater drops `operatorMetrics.loadLazyVectorTime`, and the 
corresponding metric is also absent from `genTopNTransformerMetrics`. The Velox 
native metrics already expose this field for other operators, so TopN silently 
loses it; add the metric to the map and update it here to preserve the stated 
parity with `LimitMetricsUpdater`.



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