Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18493#discussion_r125523031
--- Diff: R/pkg/R/functions.R ---
@@ -38,9 +38,9 @@ NULL
#'
#' 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
+#' @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 used to parse
--- End diff --
ah I guess it isn't consistent with `trunc` below
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