Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17369#discussion_r107086310
--- Diff: R/pkg/R/stats.R ---
@@ -149,7 +149,8 @@ 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.
+#' Note that NA values will be ignored in numerical columns before
calculation. For
+#' columns only containing Na values, an empty list is returned.
--- End diff --
`Na` -> `NA`
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