Github user felixcheung commented on the issue:

    https://github.com/apache/spark/pull/11336
  
    @wangmiao1981 These are required for the recently added CRAN checks to 
ensure we could release SparkR as a R package.
    1) - note in-line - they need to have `#' @rdname`
    2) - I'm not sure about "Column-class" we should check the generated .Rd 
file
    As for "head", I think it's because there is an existing generic and that 
has `...` in the signature
    Did it work if you skip the generic here 
`setGeneric("head")`https://github.com/apache/spark/pull/11336/files#diff-8e3d61ff66c9ffcd6ffb7a8eedc08409R555
    If not, we need to match the existing generic 
https://stat.ethz.ch/R-manual/R-devel/library/utils/html/head.html



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