Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/13660#discussion_r67018163
--- Diff: docs/sparkr.md ---
@@ -262,6 +262,67 @@ head(df)
{% endhighlight %}
</div>
+### Applying User-defined Function
+
--- End diff --
It will be good to add an introduction here that there are two kinds of
user-defined functions we support in SparkR. Something like
```
In SparkR we support two kinds for user-defined functions
1. Run a given function on a large dataset using dapply.
2. Run many functions in parallel using spark.lapply.
```
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