wuchong commented on a change in pull request #11797:
URL: https://github.com/apache/flink/pull/11797#discussion_r411198620
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/utils/WindowEmitStrategy.scala
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@@ -63,7 +63,7 @@ class WindowEmitStrategy(
def produceUpdates: Boolean = {
if (isEventTime) {
- allowLateness > 0 || earlyFireDelayEnabled || lateFireDelayEnabled
+ earlyFireDelayEnabled || lateFireDelayEnabled
Review comment:
Yes. I think this is a bug when we merging blink code. A window
aggregation can produce updates only when early fire or late fire is enabled.
`allowLateness` is just a hint to the statebackend for how long to keep the
state when window is closed. If late data never trigger emission, the window
still produce insert-only messages.
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