[GitHub] [pinot] xiangfu0 commented on a diff in pull request #11201: Return empty block if MailboxRecv nodes have no paired MailboxSender

["xiangfu0 (via GitHub)" <gi...@apache.org>]

xiangfu0 commented on code in PR #11201:
URL: https://github.com/apache/pinot/pull/11201#discussion_r1277253730


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/BaseMailboxReceiveOperator.java:
##########
@@ -59,13 +59,15 @@ public BaseMailboxReceiveOperator(OpChainExecutionContext context, RelDistributi
     int workerId = context.getServer().workerId();
     MailboxMetadata senderMailBoxMetadatas =
         context.getStageMetadata().getWorkerMetadataList().get(workerId).getMailBoxInfosMap().get(senderStageId);
-    Preconditions.checkState(senderMailBoxMetadatas != null && !senderMailBoxMetadatas.getMailBoxIdList().isEmpty(),
-        "Failed to find mailbox for stage: %s",
-        senderStageId);
-    _mailboxIds = MailboxIdUtils.toMailboxIds(requestId, senderMailBoxMetadatas);
-    _mailboxes = _mailboxIds.stream()
-        .map(mailboxId -> _mailboxService.getReceivingMailbox(mailboxId))
-        .collect(Collectors.toCollection(ArrayDeque::new));
+    if (senderMailBoxMetadatas != null && !senderMailBoxMetadatas.getMailBoxIdList().isEmpty()) {

Review Comment:
   Need to modify some tests for this behavior.



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