Github user squito commented on the issue:
https://github.com/apache/spark/pull/20645
I agree it would be nicer to have this be a more general feature. I would
prefer an approach which didn't require a different configuration name, just as
its more to document & for users to keep track of. An alternative would be to
have another syntax for appending to an options, perhaps ++= like scala , eg.
"--conf spark.executor.extraJavaOptions++=..."
You'd still need to tag the ConfigBuilder with what separator to use to
merge the values together.
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