Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r64870674
--- Diff: R/pkg/R/group.R ---
@@ -142,3 +142,54 @@ createMethods <- function() {
}
createMethods()
+
+#' gapply
+#'
+#' Applies a R function to each group in the input GroupedData
+#'
+#' @param x a GroupedData
+#' @return a SparkDataFrame
+#' @rdname gapply
+#' @name gapply
+#' @family agg_funcs
+#' @examples
+#' \dontrun{
+#' Computes the arithmetic mean of the second column by grouping
+#' on the first and third columns. Output the grouping values and the
average.
+#'
+#' df <- createDataFrame (
+#' sqlContext,
--- End diff --
remove sqlContext
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