Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/16119#discussion_r93596371
--- Diff: python/pyspark/sql/context.py ---
@@ -72,8 +72,13 @@ def __init__(self, sparkContext, sparkSession=None,
jsqlContext=None):
self._sc = sparkContext
self._jsc = self._sc._jsc
self._jvm = self._sc._jvm
+
if sparkSession is None:
- sparkSession = SparkSession(sparkContext)
+ if sparkContext is SparkContext._active_spark_context:
+ sparkSession = SparkSession.builder.getOrCreate()
--- End diff --
I found a relate discussion about multiple `SparkContext` at
http://stackoverflow.com/questions/28259756/how-to-create-multiple-sparkcontexts-in-a-console
I think the usage of multiple contexts is discouraged, even you could do it
in Scala/Java. Specially, you can't have multiple `SparkContext` in Python. So
I am not worrying that another `SparkContext` other than the active one is
passed in when constructing `SQLContext`.
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