Github user frreiss commented on a diff in the pull request:
https://github.com/apache/spark/pull/15307#discussion_r81668841
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StatefulAggregate.scala
---
@@ -56,7 +57,12 @@ case class StateStoreRestoreExec(
child: SparkPlan)
extends execution.UnaryExecNode with StatefulOperator {
+ override lazy val metrics = Map(
+ "numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of
output rows"))
--- End diff --
The metric names should probably be in a separate, centralized list of
constants. Users will want a single place in the API docs to find a list of all
available metrics, and the list is likely to change quite frequently as
Structured Streaming evolves.
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