Github user felixcheung commented on the issue:

    https://github.com/apache/spark/pull/14179
  
    A couple of test files are reusing an existing SparkSession/SparkContext by 
calling `sparkR.sparkContext` I think they are now hitting the warning 
statement that is added in this PR, somehow. I'm not sure which ones are 
calling `sparkR.sparkContext` with `sparkPackages` set. If you find them you 
are add `suppressWarnings()` around it.
    
    ```
    SerDe functionality : Error in sparkR.sparkContext(master, appName, 
sparkHome, sparkConfigMap,  : 
      (converted from warning) sparkPackages has no effect when using 
spark-submit or sparkR shell,please use the --packages commandline instead
    Calls: test_package ... eval -> eval -> sparkR.session -> 
sparkR.sparkContext
    ```



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