Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/17192#discussion_r106567583
--- Diff: R/pkg/R/functions.R ---
@@ -1795,10 +1795,10 @@ setMethod("to_date",
#' to_json
#'
-#' Converts a column containing a \code{structType} into a Column of JSON
string.
-#' Resolving the Column can fail if an unsupported type is encountered.
+#' Converts a column containing a \code{structType} or an array of
\code{structType} into a Column
+#' of JSON string. Resolving the Column can fail if an unsupported type is
encountered.
#'
-#' @param x Column containing the struct
+#' @param x Column containing the struct or an array of the structs
--- End diff --
nit: `array of structs`
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