Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18114#discussion_r123312656
--- Diff: R/pkg/R/functions.R ---
@@ -34,6 +34,58 @@ NULL
#' df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))}
NULL
+#' Date time functions for Column operations
+#'
+#' Date time functions defined for \code{Column}.
+#'
+#' @param x Column to compute on.
+#' @param format For \code{to_date} and \code{to_timestamp}, it is the
string to use to parse
+#' x Column to DateType or TimestampType. For \code{trunc},
it is the string used
+#' for specifying the truncation method. For example,
"year", "yyyy", "yy" for
+#' truncate by year, or "month", "mon", "mm" for truncate by
month.
+#' @param ... additional argument(s).
+#' @name column_datetime_functions
+#' @rdname column_datetime_functions
+#' @family data time functions
+#' @examples
+#' \dontrun{
+#' dts <- c("2005-01-02 18:47:22",
+#' "2005-12-24 16:30:58",
+#' "2005-10-28 07:30:05",
+#' "2005-12-28 07:01:05",
+#' "2006-01-24 00:01:10")
+#' y <- c(2.0, 2.2, 3.4, 2.5, 1.8)
+#' df <- createDataFrame(data.frame(time = as.POSIXct(dts), y = y))}
+NULL
+
+#' Date time arithmetic functions for Column operations
+#'
+#' Date time arithmetic functions defined for \code{Column}.
+#'
+#' @param y Column to compute on.
+#' @param x For class Column, it is used to perform arithmetic operations
with \code{y}.
+#' For class numeric, it is the number of months or days to be
added to \code{y}.
--- End diff --
`to be added or subtracted`?
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