Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21185
> that's the whole problem. Its only meant to be available on the driver,
but it ends up getting set on the executor when running in local mode.
Yea I think this is the root cause. I'm making a
[PR](https://github.com/apache/spark/pull/21190) to ban `SQLConf.get` at
executor side, shall we do the same thing for SparkSession? And fixes all the
places that mistakenly access `SparkSession` in executor.
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