Github user zero323 commented on a diff in the pull request:
https://github.com/apache/spark/pull/17728#discussion_r112844527
--- Diff: R/pkg/vignettes/sparkr-vignettes.Rmd ---
@@ -308,6 +308,21 @@ numCyl <- summarize(groupBy(carsDF, carsDF$cyl), count
= n(carsDF$cyl))
head(numCyl)
```
+`groupBy` can be replaced with `cube` or `rollup` to compute subtotals
across multiple dimensions.
--- End diff --
I keep forgetting there is one. I think we can add a few lines. This is
actually a pretty neat feature.
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