Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20031#discussion_r158481310
--- Diff: R/pkg/R/functions.R ---
@@ -40,10 +40,17 @@ NULL
#'
#' @param x Column to compute on. In \code{window}, it must be a time
Column of
#' \code{TimestampType}.
-#' @param format For \code{to_date} and \code{to_timestamp}, it is the
string to use to parse
-#' Column \code{x} to DateType or TimestampType. For
\code{trunc}, it is the string
-#' to use to specify the truncation method. For example,
"year", "yyyy", "yy" for
-#' truncate by year, or "month", "mon", "mm" for truncate by
month.
+#' @param format The format for the given dates or timestamps in Column
\code{x}. See the
+#' format used in the following methods:
+#' \itemize{
+#' \item \code{to_date} and \code{to_timestamp}: it is the
string to use to parse
+#' Column \code{x} to DateType or TimestampType.
+#' \item \code{trunc}: it is the string to use to specify
the truncation method.
+#' For example, "year", "yyyy", "yy" for truncate by
year, or "month", "mon",
+#' "mm" for truncate by month.
+#' \item \code{date_trunc}: it is similar with
\code{trunc}'s but additionally
+#' supports "day", "dd", "second", "minute", "hour",
"week" and "quarter".
+#' }
--- End diff --
I am fine with a single paragraph too. Please let me know if you have a
preference @felixcheung.
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