Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r102142543
--- 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 --
As this is a lazy val, the cloned `SparkSession` will not copy parent
`SessionState` immediately. So if the parent `SessionState` is changed, e.g.,
new functions registered, before this lazy variable initialization, the cloned
one will also have new functions.
It will not match the description `...Changes to base session are not
propagated to cloned session, cloned is independent after creation...` below.
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