Github user goldmedal commented on a diff in the pull request:
https://github.com/apache/spark/pull/19223#discussion_r138799591
--- Diff: R/pkg/R/functions.R ---
@@ -1715,7 +1717,15 @@ setMethod("to_date",
#'
#' # Converts an array of structs into a JSON array
#' df2 <- sql("SELECT array(named_struct('name', 'Bob'),
named_struct('name', 'Alice')) as people")
-#' df2 <- mutate(df2, people_json = to_json(df2$people))}
+#' df2 <- mutate(df2, people_json = to_json(df2$people))
+#'
+#' # Converts a map into a JSON object
+#' df2 <- sql("SELECT map('name', 'Bob')) as people")
+#' df2 <- mutate(df2, people_json = to_json(df2$people))
+#'
+#' # Converts an array of maps into a JSON array
+#' df2 <- sql("SELECT array(map('name', 'Bob'), map('name', 'Alice')) as
people")
+#' df2 <- mutate(df2, people_json = to_json(df2$people))
--- End diff --
ok Thanks for careful review :)
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