kennknowles commented on code in PR #37012:
URL: https://github.com/apache/beam/pull/37012#discussion_r2818760785


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sdks/java/harness/src/main/java/org/apache/beam/fn/harness/FnApiDoFnRunner.java:
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Review Comment:
   I am not sure. This file was a huge mess, with actually many types of 
transforms executed in the same file via switch statements. It may just be an 
accidental piece of history and/or a part that I failed to refactor when I 
introduced OutputBuilder. My quick read is that this one is the idea way to do 
it, because it passes the whole WindowedValue to the FnDataReceiver so it 
doesn't lose dasta. In the other places where it goes through the 
OnTimerContext it loses metadata.



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