Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19061
@dongjoon-hyun I'm just thinking if other repl-like projects may actually
require this, you changes here make them fail to leverage this feature. Did you
see any issue with this feature on in non-shell apps?
Also I think you should do the check in SparkConf because user can still
set this with SparkConf in run-time.
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