Github user walterddr commented on a diff in the pull request:
https://github.com/apache/flink/pull/5555#discussion_r183222457
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/OverAggregate.scala
---
@@ -70,7 +70,12 @@ trait OverAggregate {
val aggStrings = namedAggregates.map(_.getKey).map(
a => s"${a.getAggregation}(${
- if (a.getArgList.size() > 0) {
+ val prefix = if (a.isDistinct) {
--- End diff --
will address in FLINK-8690---
