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[SPARK-32160][CORE][PYSPARK] Add a config to switch allow/disallow to…
… create SparkContext in executors ### What changes were proposed in this pull request? This is a follow-up of #28986. This PR adds a config to switch allow/disallow to create `SparkContext` in executors. - `spark.driver.allowSparkContextInExecutors` ### Why are the changes needed? Some users or libraries actually create `SparkContext` in executors. We shouldn't break their workloads. ### Does this PR introduce _any_ user-facing change? Yes, users will be able to create `SparkContext` in executors with the config enabled. ### How was this patch tested? More tests are added. Closes #29278 from ueshin/issues/SPARK-32160/add_configs. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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