Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19243#discussion_r139665152
--- Diff: R/pkg/R/DataFrame.R ---
@@ -998,33 +998,39 @@ setMethod("unique",
#' sparkR.session()
#' path <- "path/to/file.json"
#' df <- read.json(path)
+#' collect(sample(df, fraction=0.5))
#' collect(sample(df, FALSE, 0.5))
-#' collect(sample(df, TRUE, 0.5))
+#' collect(sample(df, TRUE, 0.5, seed=3))
--- End diff --
D'oh.
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