Github user hequn8128 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3733#discussion_r112817965
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamGroupWindowAggregate.scala
---
@@ -107,6 +107,14 @@ class DataStreamGroupWindowAggregate(
val groupingKeys = grouping.indices.toArray
val inputDS =
input.asInstanceOf[DataStreamRel].translateToPlan(tableEnv)
+ val consumeRetraction = DataStreamRetractionRules.isAccRetract(input)
+
+ if (consumeRetraction) {
+ throw new TableException(
+ "Retraction on group window is not supported yet. Note: Currently,
group window should " +
+ "not follow an unbounded groupby.")
--- End diff --
yes, non-windowed is more clear
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