Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17192#discussion_r105566634
--- Diff: R/pkg/R/functions.R ---
@@ -1809,8 +1809,13 @@ setMethod("to_date",
#' @export
#' @examples
#' \dontrun{
-#' to_json(df$t, dateFormat = 'dd/MM/yyyy')
-#' select(df, to_json(df$t))
+#' # Converts a struct into a JSON object
+#' df <- sql("SELECT named_struct('date', cast('2000-01-01' as date)) as
d")
+#' select(df, to_json(df$d, dateFormat = 'dd/MM/yyyy'))
+#'
+#' # Converts an array of structs into a JSON array
+#' df <- sql("SELECT array(named_struct('date', cast('2000-01-01' as
date))) as d")
--- End diff --
nit: maybe add multiple struct in the array instead of just one?
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