Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/22455#discussion_r219030085
--- Diff: docs/sparkr.md ---
@@ -450,6 +450,42 @@ print(model.summaries)
{% endhighlight %}
</div>
+### Eager execution
+
+If the eager execution is enabled, the data will be returned to R client
immediately when the `SparkDataFrame` is created. Eager execution can be
enabled by setting the configuration property
`spark.sql.repl.eagerEval.enabled` to `true` when the `SparkSession` is started
up.
+
+<div data-lang="r" markdown="1">
+{% highlight r %}
+
+# Start up spark session with eager execution enabled
+sparkR.session(master = "local[*]", sparkConfig =
list(spark.sql.repl.eagerEval.enabled = "true"))
+
+df <- createDataFrame(faithful)
--- End diff --
perhaps a more complete example - like `summarize(groupBy(df, df$waiting),
count = n(df$waiting))`
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