Github user felixcheung commented on the issue:
    @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 
    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 
    If not, we need to match the existing generic

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