Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4105#discussion_r126865636
--- Diff:
flink-libraries/flink-table/src/test/java/org/apache/flink/table/api/java/utils/UserDefinedAggFunctions.java
---
@@ -59,7 +59,7 @@ public boolean requiresOver() {
/**
* Accumulator for WeightedAvg.
*/
- public static class WeightedAvgAccum extends Tuple2<Long, Integer> {
--- End diff --
TypeExtractor will recognize `WeightedAvgAccum` as a `TupleType` which will
ignore the `sum` and `count` fields when de/serialize. So I changed it as a
POJO class. This should not be included in this PR. But I fixed it when I find
it.
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