harshitsingh070 opened a new pull request, #837:
URL: https://github.com/apache/wayang/pull/837

   Fixes a bug in the Java ReduceBy combiner where `list1` was incorrectly 
discarded when `list2` was empty.
   
   The combiner now returns `list1` when `list2` is empty, preserving the 
existing grouped values.
   
   Closes #833


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