Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/20404#discussion_r164108216
--- Diff: python/pyspark/sql/session.py ---
@@ -225,6 +225,7 @@ def __init__(self, sparkContext, jsparkSession=None):
if SparkSession._instantiatedSession is None \
or SparkSession._instantiatedSession._sc._jsc is None:
SparkSession._instantiatedSession = self
+
self._jvm.org.apache.spark.sql.SparkSession.setDefaultSession(self._jsparkSession)
--- End diff --
>Btw, shall we clear it when stopping PySpark SparkSession?
JVM SparkSession will clear it when application is stopped
(https://github.com/apache/spark/blob/3e252514741447004f3c18ddd77c617b4e37cfaa/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala#L961).
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