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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