Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20404#discussion_r164122074
--- 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 --
Simplest way I can think of is just add it in `def stop`:
```
self._jvm.org.apache.spark.sql.SparkSession.clearDefaultSession()
```
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