Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3207#discussion_r97774041
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/functions/AggregateFunction.java
---
@@ -81,14 +104,55 @@
* }
* }
* }</pre>
+ *
+ * @param <IN> The type of the values that are aggregated (input values)
+ * @param <ACC> The type of the accumulator (intermediate aggregate state).
+ * @param <OUT> The type of the aggregated result
*/
+@PublicEvolving
public interface AggregateFunction<IN, ACC, OUT> extends Function,
Serializable {
+ /**
+ * Creates a new accumulator, starting a new aggregate.
+ *
+ * <p>The new accumulator iy typically meaningless unless a value is
added
--- End diff --
Typo: "is typically"
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