Github user zjffdu commented on the pull request:
https://github.com/apache/spark/pull/13160#issuecomment-219910757
Changing sql conf setting seems a better approach. Besides that some other
setting in SparkSession#Build also won't take effect if there's already an
existing SparkContext. e.g. if there's an local mode SparkContext, then user
can not create SparkSession of yarn-cluster mode, At least we need to add
warning message for that case.
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