Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12141#discussion_r58468936
--- Diff: R/pkg/R/functions.R ---
@@ -2131,6 +2131,65 @@ setMethod("from_unixtime", signature(x = "Column"),
column(jc)
})
+#' window
+#'
+#' Bucketize rows into one or more time windows given a timestamp
specifying column. Window
+#' starts are inclusive but the window ends are exclusive, e.g. 12:05 will
be in the window
+#' [12:05,12:10) but not in [12:00,12:05). Windows can support microsecond
precision. Windows in
+#' the order of months are not supported.
+#'
+#' The time column must be of TimestampType.
+#'
+#' Durations are provided as strings, e.g. '1 second', '1 day 12 hours',
'2 minutes'. Valid
+#' interval strings are 'week', 'day', 'hour', 'minute', 'second',
'millisecond', 'microsecond'.
+#' If the `slideDuration` is not provided, the windows will be tumbling
windows.
+#'
+#' The startTime is the offset with respect to 1970-01-01 00:00:00 UTC
with which to start
+#' window intervals. For example, in order to have hourly tumbling windows
that start 15 minutes
+#' past the hour, e.g. 12:15-13:15, 13:15-14:15... provide `startTime` as
`15 minutes`.
+#'
+#' The output column will be a struct called 'window' by default with the
nested columns 'start'
+#' and 'end'.
+#'
+#' @family datetime_funcs
+#' @rdname window
+#' @name window
+#' @export
+#' @examples
+#'\dontrun{
+#' # One minute windows every 15 seconds 10 seconds after the minute,
e.g. 09:00:10-09:01:10,
+#' # 09:00:25-09:01:25, 09:00:40-09:01:40, ...
+#' window(df$time, "1 minute", "15 seconds", "10 seconds")
+#'
+#' # One minute tumbling windows 15 seconds after the minute, e.g.
09:00:15-09:01:15,
+#' # 09:01:15-09:02:15...
+#' window(df$time, "1 minute", startTime = "15 seconds")
+#'
+#' # Thirty second windows every 10 seconds, e.g. 09:00:00-09:00:30,
09:00:10-09:00:40, ...
+#' window(df$time, "30 seconds", "10 seconds")
+#'}
+setMethod("window", signature(x = "Column"),
+ function(x, windowDuration, slideDuration = NULL, startTime =
NULL) {
+ if (!is.null(slideDuration) && !is.null(startTime)) {
--- End diff --
Check we check the type of windowDuration, slideDuration and startTime?
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