Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/22921#discussion_r231403827
--- Diff: R/pkg/R/functions.R ---
@@ -319,6 +319,27 @@ setMethod("acos",
column(jc)
})
+#' @details
+#' \code{approx_count_distinct}: Returns the approximate number of
distinct items in a group.
+#'
+#' @rdname column_aggregate_functions
+#' @aliases approx_count_distinct approx_count_distinct,Column-method
+#' @examples
+#'
+#' \dontrun{
+#' head(select(df, approx_count_distinct(df$gear)))
+#' head(select(df, approx_count_distinct(df$gear, 0.02)))
+#' head(select(df, countDistinct(df$gear, df$cyl)))
+#' head(select(df, n_distinct(df$gear)))
+#' head(distinct(select(df, "gear")))}
--- End diff --
we only need one set - they both are `@rdname column_aggregate_functions`
so will duplicate all other examples
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