Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r100195324
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -213,6 +218,24 @@ class SparkSession private(
new SparkSession(sparkContext, Some(sharedState))
}
+ /**
+ * Start a new session, sharing the underlying `SparkContext` and cached
data.
+ * If inheritSessionState is enabled, then SQL configurations, temporary
tables,
+ * registered functions are copied over from parent `SparkSession`.
+ *
+ * @note Other than the `SparkContext`, all shared state is initialized
lazily.
+ * This method will force the initialization of the shared state to
ensure that parent
+ * and child sessions are set up with the same shared state. If the
underlying catalog
+ * implementation is Hive, this will initialize the metastore, which may
take some time.
--- End diff --
nit: add `@since 2.1.1`
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