Github user felixcheung commented on the issue:
    Most methods in context.R are not exported (except `spark.lapply` and 
`setLogLevel`) and therefore they are not publically accessible from the R 
    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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