Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/incubator-flink/pull/87#discussion_r15665104
--- Diff: docs/java_api_transformations.md ---
@@ -431,6 +435,30 @@ DataSet<Tuple2<String, Double>>
.with(new PointWeighter());
```
+#### Join with FlatJoinFunction
+
+Analogous to Map and FlatMap, a FlatJoin function behaves in the same
+way as a JoinFunction, but instead of returning one element, it can
+return (collect), zero, one, or more elements
+
+{% highlight java %}
+public class PointWeighter
+ implements FlatJoinFunction<Rating, Tuple2<String, Double>,
Tuple2<String, Double>> {
+
+ @Override
+ public void join(Rating rating, Tuple2<String, Double> weight,
+
+ Collector<Tuple2<String, Double>> out) {
+ if (weight.f1 > 0.1)
+ out.collect(new Tuple2<String, Double>(rating.name,
rating.points * weight.f1));
--- End diff --
we enforce inside the main code to always use brackets around statements.
(I think its the famous `goto fail;`).
I think its better to have them in the documentation as well (to educate
users that might become committers)
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