Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18116#discussion_r118634196
--- Diff: R/pkg/R/functions.R ---
@@ -4015,3 +4015,29 @@ setMethod("input_file_name", signature("missing"),
jc <- callJStatic("org.apache.spark.sql.functions",
"input_file_name")
column(jc)
})
+
+#' trunc
+#'
+#' Returns date truncated to the unit specified by the format.
+#'
+#' @param x Column to compute on.
+#' @param format string used for specify the truncation method. For
example, "year", "yyyy",
+#' "yy" for truncate by year, or "month", "mon", "mm" for truncate by
month.
+#'
+#' @rdname trunc
+#' @name trunc
+#' @family date time functions
+#' @aliases trunc,Column-method
+#' @export
+#' @examples
+#' \dontrun{
+#' trunc(df$c, "year")
+#' trunc(df$c, "month")
+#' }
+#' @note trunc since 2.3.0
+setMethod("trunc",
+ signature(x = "Column"),
+ function(x, format = "year") {
--- End diff --
perhaps we shouldn't have a default value? python or scala doesn't
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