Github user zero323 commented on a diff in the pull request: https://github.com/apache/spark/pull/17851#discussion_r114702184 --- 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. +#' +#' @param x a SparkDataFrame. +#' @param name a name of the hint. +#' @param ... additional argument(s) passed to the method. +#' +#' @return A SparkDataFrame. +#' @family SparkDataFrame functions +#' @aliases hint,SparkDataFrame,character-method +#' @rdname hint +#' @name hint +#' @export +#' @examples +#' \dontrun{ +#' df <- createDataFrame(mtcars) +#' avg_mpg <- mean(groupBy(createDataFrame(mtcars), "cyl"), "mpg") --- End diff -- I wanted to use different datasets to avoid aliasing and _trivially equal_ warning. It works but it is confusing (note: equi-join syntax same as in Scala or Python would be great, and it shouldn't be that hard to add). Once we merge `alias` this shouldn't been an issue. Since we don't run it, I can add aliases now.
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