Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17851#discussion_r114698385
--- Diff: R/pkg/R/DataFrame.R ---
@@ -3715,3 +3715,34 @@ setMethod("rollup",
sgd <- callJMethod(x@sdf, "rollup", jcol)
groupedData(sgd)
})
+
+#' hint
+#'
+#' Specifies execution plan hint on the current SparkDataFrame.
--- End diff --
the R programming model is a bit different - I think it is better to point
out the original SparkDataFrame is not actually changed - instead say `....
hint and return a new SparkDataFrame` is better
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