Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4372#discussion_r128351347
--- Diff: docs/dev/batch/index.md ---
@@ -205,20 +205,25 @@ data.filter(new FilterFunction<Integer>() {
<td><strong>Reduce</strong></td>
<td>
<p>Combines a group of elements into a single element by
repeatedly combining two elements
- into one. Reduce may be applied on a full data set, or on a
grouped data set.</p>
+ into one. Reduce may be applied on a full data set or on a grouped
data set.</p>
{% highlight java %}
data.reduce(new ReduceFunction<Integer> {
public Integer reduce(Integer a, Integer b) { return a + b; }
});
{% endhighlight %}
+ <p>If the reduce was applied to a grouped data set then you can
specify the way that the
--- End diff --
`If the reduce was ...` -> `If the reduce transformation was ...` or `If
the reduce function was ...`?
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