Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20136#discussion_r159247039 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -70,7 +72,12 @@ object SQLConf { * Default config. Only used when there is no active SparkSession for the thread. * See [[get]] for more information. */ - private val fallbackConf = new ThreadLocal[SQLConf] { + private lazy val fallbackConf = new ThreadLocal[SQLConf] { + if (Utils.isTesting && SparkEnv.get != null) { --- End diff -- shall we just put this check in the constructor?
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