Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/12851#issuecomment-217048754
@techaddict a general point is to try to get the `SparkContext` from the
`SparkSession` rather than the other way round. Right now we call
`getOrCreate()` and assume there's a `SparkContext` nearby, which may be true
but is kind of brittle and outright wrong in some cases.
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