Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/13660#discussion_r67029622
--- Diff: docs/sparkr.md ---
@@ -262,6 +262,67 @@ head(df)
{% endhighlight %}
</div>
+### Applying User-defined Function
+
+#### dapply
+Apply a function to each partition of `SparkDataFrame`. The function to be
applied to each partition of the `SparkDataFrame` and should have only one
parameter, to which a `data.frame` corresponds to each partition will be
passed. The output of function should be a `data.frame`.
--- End diff --
perhaps explain why the schema needs to be passed here?
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