Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21721#discussion_r206373655
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ProgressReporter.scala
---
@@ -143,18 +151,46 @@ trait ProgressReporter extends Logging {
}
logDebug(s"Execution stats: $executionStats")
+ // extracts custom metrics from readers and writers
+ def extractMetrics(getMetrics: () => Option[CustomMetrics],
+ onInvalidMetrics: (Exception) => Unit):
Option[JValue] = {
--- End diff --
nit:
```scala
def extractMetrics(
getMetrics: () => Option[CustomMetrics],
onInvalidMetrics: (Exception) => Unit): Option[JValue] = {
```
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