Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/20404#discussion_r164364573
--- Diff: python/pyspark/sql/session.py ---
@@ -225,6 +230,9 @@ def __init__(self, sparkContext, jsparkSession=None):
if SparkSession._instantiatedSession is None \
or SparkSession._instantiatedSession._sc._jsc is None:
SparkSession._instantiatedSession = self
+ if self._jvm.SparkSession.getDefaultSession().isEmpty() \
+ or not
jsparkSession.equals(self._jvm.SparkSession.getDefaultSession().get()):
+
self._jvm.SparkSession.setDefaultSession(self._jsparkSession)
--- End diff --
@felixcheung has concern about simply overwriting the default session.
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