Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12213#discussion_r58790852
--- Diff: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala ---
@@ -56,7 +55,7 @@ private[spark] object JsonProtocol {
private implicit val format = DefaultFormats
- private val mapper = new
ObjectMapper().registerModule(DefaultScalaModule)
--- End diff --
This was added in #10061 in order to allow the new
`SparkListenerSQLExecutionStart` and `SparkListenerSQLExecutionEnd` events to
be written to the event log using Jackson. I'll see if there's an existing unit
test for roundtrip serialization of these events.
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