Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3354#discussion_r102835493
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/aggfunctions/SumAggFunction.scala
---
@@ -32,7 +31,8 @@ abstract class SumAggFunction[T: Numeric] extends
AggregateFunction[T] {
/** The initial accumulator for Sum aggregate function */
class SumAccumulator[T] extends JTuple2[T, Boolean] with Accumulator {
- var sum: T = null.asInstanceOf[T]
+ f0 = 0.asInstanceOf[T] //sum
--- End diff --
change this to `f0 = numeric.zero`
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