kennknowles commented on a change in pull request #14001:
URL: https://github.com/apache/beam/pull/14001#discussion_r577899082
##########
File path:
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/WindowingStrategyTranslation.java
##########
@@ -295,10 +299,17 @@ public static FunctionSpec toProto(WindowFn<?, ?>
windowFn, SdkComponents compon
.setAllowedLateness(windowingStrategy.getAllowedLateness().getMillis())
.setTrigger(TriggerTranslation.toProto(windowingStrategy.getTrigger()))
.setWindowFn(windowFnSpec)
-
.setAssignsToOneWindow(windowingStrategy.getWindowFn().assignsToOneWindow())
+ .setAssignsToOneWindow(windowFn.assignsToOneWindow())
+ .setMergeStatus(
+ windowFn instanceof InvalidWindows
+ ? (((InvalidWindows)
windowFn).getOriginalWindowFn().isNonMerging()
Review comment:
It is a good question. I think the original WindowFn is just for giving
a good error message. It is also used to check compatibility of `Flatten` of
two PCollections.
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