Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/22295#discussion_r224983583 --- 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 -- Oh, okay. I had to be explicit. I meant: ```scala scala> import org.apache.spark.sql.SparkSession import org.apache.spark.sql.SparkSession scala> SparkSession.getActiveSession res0: Option[org.apache.spark.sql.SparkSession] = Some(org.apache.spark.sql.SparkSession@3ef4a8fb) scala> val session1 = spark session1: org.apache.spark.sql.SparkSession = org.apache.spark.sql.SparkSession@3ef4a8fb scala> val session2 = spark.newSession() session2: org.apache.spark.sql.SparkSession = org.apache.spark.sql.SparkSession@4b74a4d scala> SparkSession.getActiveSession res1: Option[org.apache.spark.sql.SparkSession] = Some(org.apache.spark.sql.SparkSession@3ef4a8fb) scala> session2.createDataFrame(Seq(Tuple1(1))) res2: org.apache.spark.sql.DataFrame = [_1: int] scala> SparkSession.getActiveSession res3: Option[org.apache.spark.sql.SparkSession] = Some(org.apache.spark.sql.SparkSession@4b74a4d) ```
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