HyukjinKwon commented on a change in pull request #27046:
[SPARK-29348][SQL][FOLLOWUP] Add example of batch query for observable metrics
URL: https://github.com/apache/spark/pull/27046#discussion_r361899207
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -1891,14 +1891,34 @@ class Dataset[T] private[sql](
* [[org.apache.spark.sql.util.QueryExecutionListener]] to the spark session.
*
* {{{
- * // Observe row count (rc) and error row count (erc) in the streaming
Dataset
+ * // Monitor the metrics for batch query using a listener.
+ * spark.listenerManager.register(new QueryExecutionListener() {
+ * override def onSuccess(funcName: String, qe: QueryExecution,
durationNs: Long): Unit = {
+ * qe.observedMetrics.get("my_event").foreach { row =>
Review comment:
We should also change `observedMetrics` in `QueryExecution` to Java map to
make it consistent and to support Java API properly with Java.
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