Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/16138#discussion_r97462585 --- Diff: R/pkg/R/functions.R --- @@ -1730,24 +1730,82 @@ setMethod("toRadians", #' to_date #' -#' Converts the column into DateType. +#' Converts the column into DateType, optionally with a format. Returns null if input is invalid. +#' Specify formats according to: http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html --- End diff -- put url inside `\url{https://spark.apache.org/docs/latest/sparkr.html#sparkr-dataframes}` or as a separate line `#' @seealso \url{https://spark.apache.org/docs/latest/sparkr.html#sparkr-dataframes}`
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