Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22455#discussion_r219897812
--- Diff: docs/sparkr.md ---
@@ -450,6 +450,48 @@ 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.
+
+Maximum number of rows and maximum number of characters per column of data
to display can be controlled by `spark.sql.repl.eagerEval.maxNumRows` and
`spark.sql.repl.eagerEval.truncate` configuration properties, respectively.
--- End diff --
Let's note the default values.
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