Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/15131
@yanboliang
Most methods in context.R are not exported (except `spark.lapply` and
`setLogLevel`) and therefore they are not publically accessible from the R
package.
Does this work with an existing SparkContext/SparkSession? if yes, one
approach would be to follow `spark.lapply` or `setLogLevel` in getting the
current SparkContext.
(yes, I think the current approach with public methods named `sparkR.*` and
`spark.*` is a bit messy and has the problem with S3 convention as mentioned
above; generally we try to have `sparkR.*` for initialization stuff and
`spark.*` for Spark specific, non-initialization stuff)
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