Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/22295#discussion_r221089916
--- Diff: python/pyspark/sql/session.py ---
@@ -231,6 +231,7 @@ def __init__(self, sparkContext, jsparkSession=None):
or SparkSession._instantiatedSession._sc._jsc is None:
SparkSession._instantiatedSession = self
self._jvm.SparkSession.setDefaultSession(self._jsparkSession)
+ self._jvm.SparkSession.setActiveSession(self._jsparkSession)
--- End diff --
@HyukjinKwon Seems to me that active session is set OK in the
```__init__```. When createDataFrame, we already have a session, and the active
session is already set in the ```__init__```.
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