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[SPARK-32160][CORE][PYSPARK] Disallow to create SparkContext in execu…
…tors ### What changes were proposed in this pull request? This PR proposes to disallow to create `SparkContext` in executors, e.g., in UDFs. ### Why are the changes needed? Currently executors can create SparkContext, but shouldn't be able to create it. ```scala sc.range(0, 1).foreach { _ => new SparkContext(new SparkConf().setAppName("test").setMaster("local")) } ``` ### Does this PR introduce _any_ user-facing change? Yes, users won't be able to create `SparkContext` in executors. ### How was this patch tested? Addes tests. Closes #28986 from ueshin/issues/SPARK-32160/disallow_spark_context_in_executors. Authored-by: Takuya UESHIN <ueshin@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org> (cherry picked from commit cfecc20) Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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