Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17901#discussion_r115397690
--- Diff: R/pkg/R/functions.R ---
@@ -1752,15 +1752,15 @@ setMethod("toRadians",
#' to_date
#'
-#' Converts the column into a DateType. You may optionally specify a format
+#' Converts the column into a date column. You may optionally specify a
format
#' according to the rules in:
#'
\url{http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html}.
#' If the string cannot be parsed according to the specified format (or
default),
#' the value of the column will be null.
-#' The default format is 'yyyy-MM-dd'.
+#' By default, it follows casting rules to a date if the format is omitted.
#'
#' @param x Column to parse.
-#' @param format string to use to parse x Column to DateType. (optional)
+#' @param format string to use to parse x column to a date column.
(optional)
--- End diff --
`Column` is a type in R, so it's intentional to captialize it
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