Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4009#discussion_r118946203
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/aggregation/SumAggregationFunction.java
---
@@ -26,6 +26,10 @@
import org.apache.flink.types.LongValue;
import org.apache.flink.types.ShortValue;
+/**
+ * Definitions of sum function for different numerical types.
--- End diff --
-> "of sum functions"
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