Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18501
My commit was reverted because my assumption was wrong. Some configurations
have to be set before creating `SparkContext`, so we can't just create
`SparkContext` and then set confs.
So the corrected logic should be:
1. if `SparkContext` is not created, build a `SparkConf` including the
given options, and create `SparkContext`.
2. if `SparkContext` has been created, set its conf according to the given
options.
Then we can safely remove the line `options.foreach { case (k, v) =>
session.sessionState.conf.setConfString(k, v) }`
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