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

    https://github.com/apache/spark/pull/14192#discussion_r70744731
  
    --- Diff: R/pkg/R/window.R ---
    @@ -17,23 +17,23 @@
     
     # window.R - Utility functions for defining window in DataFrames
     
    -#' window.partitionBy
    +#' windowPartitionBy
     #'
     #' Creates a WindowSpec with the partitioning defined.
     #'
    -#' @rdname window.partitionBy
    -#' @name window.partitionBy
    +#' @rdname windowPartitionBy
    +#' @name windowPartitionBy
     #' @export
     #' @examples
     #' \dontrun{
    -#'   ws <- window.partitionBy("key1", "key2")
    +#'   ws <- windowPartitionBy("key1", "key2")
     #'   df1 <- select(df, over(lead("value", 1), ws))
     #'
    -#'   ws <- window.partitionBy(df$key1, df$key2)
    +#'   ws <- windowPartitionBy(df$key1, df$key2)
     #'   df1 <- select(df, over(lead("value", 1), ws))
     #' }
    -#' @note window.partitionBy(character) since 2.0.0
    -setMethod("window.partitionBy",
    +#' @note windowPartitionBy(character) since 2.0.0
    +setMethod("windowPartitionBy",
    --- End diff --
    
    minor comment: Can we document the parameter `@param col` that is in all 
the 4 functions ? That'll also remove some of the CRAN warnings


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