Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22295#discussion_r221104383
--- 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 --
> When createDataFrame, we already have a session
but wouldn't we not set the active session properly if session A sets an
active session in `__init__`, and then session B sets an active session in
`__init__`, and then session A calls `createDataFrame` ?
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