afavaro commented on a change in pull request #27610: 
[SPARK-30856][SQL][PySpark] Fix SQLContext.getOrCreate() when SparkContext is 
restarted
URL: https://github.com/apache/spark/pull/27610#discussion_r381167953
 
 

 ##########
 File path: python/pyspark/sql/session.py
 ##########
 @@ -699,12 +699,14 @@ def streams(self):
     def stop(self):
         """Stop the underlying :class:`SparkContext`.
         """
+        from pyspark.sql.context import SQLContext
         self._sc.stop()
         # We should clean the default session up. See SPARK-23228.
         self._jvm.SparkSession.clearDefaultSession()
         self._jvm.SparkSession.clearActiveSession()
         SparkSession._instantiatedSession = None
         SparkSession._activeSession = None
+        SQLContext._instantiatedContext = None
 
 Review comment:
   Done

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