cloud-fan commented on a change in pull request #31398:
URL: https://github.com/apache/spark/pull/31398#discussion_r619053090
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/metric/CustomMetrics.scala
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@@ -47,7 +47,8 @@ object CustomMetrics {
}
/**
- * Built-in `CustomMetric` that sums up metric values.
+ * Built-in `CustomMetric` that sums up metric values. Note that please extend
this class
+ * and override `name` and `description` to create your custom metric for real
usage.
*/
class CustomSumMetric extends CustomMetric {
Review comment:
shall we make it an abstract class and force people to implement name
and description?
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