Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r102547527
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -117,9 +122,11 @@ class SparkSession private(
@InterfaceStability.Unstable
@transient
lazy val sessionState: SessionState = {
- SparkSession.reflect[SessionState, SparkSession](
- SparkSession.sessionStateClassName(sparkContext.conf),
- self)
+ parentSessionState
+ .map(_.copy(this))
--- End diff --
Good point. I think we can force materializing these lazy val before
cloneSession returns. Unfortunately, we cannot remove lazy because of the
complicated cycle dependencies in these objects.
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