Github user NarineK commented on a diff in the pull request:
https://github.com/apache/spark/pull/13660#discussion_r67944525
--- Diff: docs/sparkr.md ---
@@ -262,6 +262,83 @@ head(df)
{% endhighlight %}
</div>
+### Applying User-defined Function
+In SparkR, we support several kinds for User-defined Functions:
+
+#### Run a given function on a large dataset using `dapply` or
`dapplyCollect`
+
+##### dapply
+Apply a function to each partition of `SparkDataFrame`. The function to be
applied to each partition of the `SparkDataFrame`
--- End diff --
@sun-rui , will do gapply in another PR.
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