walterddr commented on code in PR #9064:
URL: https://github.com/apache/pinot/pull/9064#discussion_r928123725


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/service/QueryDispatcher.java:
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@@ -118,6 +119,10 @@ public static List<DataTable> 
reduceMailboxReceive(MailboxReceiveOperator mailbo
     while (true) {
       transferableBlock = mailboxReceiveOperator.nextBlock();
       if (TransferableBlockUtils.isEndOfStream(transferableBlock)) {
+        if (transferableBlock.isErrorBlock()) {

Review Comment:
   correct. end-of-stream means no more blocks will be send. 
   it could mean 
   - all data has been transferred, and not error
   - all data transfer has been halted because of error



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