zsxwing commented on a change in pull request #28607:
URL: https://github.com/apache/spark/pull/28607#discussion_r439853232
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala
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@@ -77,6 +77,8 @@ trait StateStoreWriter extends StatefulOperator { self:
SparkPlan =>
override lazy val metrics = Map(
"numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output
rows"),
+ "numLateInputs" -> SQLMetrics.createMetric(sparkContext,
Review comment:
nit: maybe name it as `numDroppedRowsByWatermark`? Technically, we don't
guarantee to drop all late inputs. So this metric doesn't report the accurate
number of late inputs.
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