Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/16951#discussion_r101453993
--- Diff: R/pkg/R/stats.R ---
@@ -149,15 +149,18 @@ setMethod("freqItems", signature(x =
"SparkDataFrame", cols = "character"),
#' This method implements a variation of the Greenwald-Khanna algorithm
(with some speed
#' optimizations). The algorithm was first present in
[[http://dx.doi.org/10.1145/375663.375670
#' Space-efficient Online Computation of Quantile Summaries]] by Greenwald
and Khanna.
+#' Note that rows containing any NA values will be removed before
calculation.
#'
#' @param x A SparkDataFrame.
-#' @param col The name of the numerical column.
+#' @param cols The names of the numerical columns.
--- End diff --
we should be clear that this can be one or more columns
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