Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4009#discussion_r118947281
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/functions/GroupReduceIterator.java
---
@@ -24,6 +24,11 @@
import java.util.Iterator;
+/**
+ * Base class that simplifies reducing all values provided as {@link
Iterable}.
--- End diff --
-> "A {@link RichGroupReduceFunction}" that returns an {@link Iterable}
instead."
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