Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3470#discussion_r104298360
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/aggfunctions/SumAggFunction.scala
---
@@ -67,9 +80,9 @@ abstract class SumAggFunction[T: Numeric] extends
AggregateFunction[T] {
var i: Int = 0
while (i < accumulators.size()) {
val a = accumulators.get(i).asInstanceOf[SumAccumulator[T]]
- if (a.f1) {
+ if (a.f1 > 0) {
--- End diff --
Do we need this check? If `a.f1` is `0`, `a.f0` should be `0` as well (if
we only retract what was added before) and we can simply add sum and count.
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