Github user felixcheung commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17825#discussion_r114932485
  
    --- Diff: R/pkg/R/generics.R ---
    @@ -387,6 +387,16 @@ setGeneric("value", function(bcast) { 
standardGeneric("value") })
     #' @export
     setGeneric("agg", function (x, ...) { standardGeneric("agg") })
     
    +#' alias
    +#'
    +#' Set a new name for a Column or a SparkDataFrame. Equivalent to SQL "AS" 
keyword.
    +#'
    +#' @name alias
    +#' @rdname alias
    +#' @param object x a Column or a SparkDataFrame
    +#' @param data new name to use
    --- End diff --
    
    that's true actually.
    if you think it's useful we could always have them in separate rd.
    I'm pretty sure `@rdname` needs to match `@aliases` to fix multiple link 
bug https://issues.apache.org/jira/browse/SPARK-18825; which means we can't 
have multiple functions in the same rd - each has to have its own.


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