Github user juliuszsompolski commented on a diff in the pull request:
https://github.com/apache/spark/pull/20136#discussion_r159408791
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -70,7 +72,7 @@ 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] {
--- End diff --
When I checked (which was before I moved the assertion from here to SQLConf
constructor, but it shouldn't matter), not having it as lazy resulted in it
being instantiated eagerly as a static member of SQLConf object before SparkEnv
was set and hitting the null on SparkEnv.
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