gortiz commented on code in PR #11205:
URL: https://github.com/apache/pinot/pull/11205#discussion_r1277744774


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/BaseMailboxReceiveOperator.java:
##########
@@ -90,9 +106,108 @@ public void cancel(Throwable t) {
   }
 
   protected void cancelRemainingMailboxes() {
-    ReceivingMailbox mailbox;
-    while ((mailbox = _mailboxes.poll()) != null) {
+    for (ReceivingMailbox mailbox : _mailboxes) {
       mailbox.cancel();
     }
   }
+
+  public void onData() {
+    _lock.lock();
+    try {
+      _notEmpty.signal();

Review Comment:
   This is how we unblock the reader opchain thread



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