dongxiaoman commented on a change in pull request #8272:
URL: https://github.com/apache/pinot/pull/8272#discussion_r817982059



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/query/reduce/StreamingReduceService.java
##########
@@ -127,23 +129,19 @@ private static void 
processIterativeServerResponse(StreamingReducer reducer, Exe
               aggregator.aggregate(entry.getKey(), dataTable);
             }
           }
+          return null;

Review comment:
       Yes good point. I think it was originally something with throwing 
Exceptions while `ExecutorService.submit` is called, and the Future<Void> asks 
for a return value (at least in my IDE it is red).
   Anyway, changed now.




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