Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21815#discussion_r203679141 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala --- @@ -69,7 +67,9 @@ abstract class SparkPlan extends QueryPlan[SparkPlan] with Logging with Serializ /** Overridden make copy also propagates sqlContext to copied plan. */ override def makeCopy(newArgs: Array[AnyRef]): SparkPlan = { - SparkSession.setActiveSession(sqlContext.sparkSession) + if (sqlContext != null) { --- End diff -- Because it looks failed ahead. Once we go with `lazy` then it's discovered later (the exception message in the PR description).
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