[PR] Fixes metadata propagation from doFn output to next parDo by introducing new interface and plumbing propagation [beam]

Fri, 13 Mar 2026 09:23:28 -0700 


stankiewicz opened a new pull request, #37851:
URL: https://github.com/apache/beam/pull/37851

   When data is outputted with processContext, outputReceiver or builder, it's 
going through 
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/DoFnOutputReceivers.java
 which was still using context.outputWindowedValue(element, ts, windows, pane 
...) interface which we decided to abandon as adding new metadata requires 
changing this interface and we should use builder and windowedValue interface. 
   
   - adds new outputWindowedValue(WV) public interface with implementations
   - add tests to cover metadata propagation across parDos in single and 
mulitple stages for direct runner
   - plumbs metadata propagation, where it was lost previously.
   
   
   
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