agavra commented on issue #9904:
URL: https://github.com/apache/pinot/issues/9904#issuecomment-1335863433

   I see the following in the logs:
   
   ```
   2022/12/02 13:25:40.861 ERROR [MailboxSendOperator] 
[query_worker_on_8842_port-1-thread-8] Exception occur while sending data via 
mailbox
   java.lang.RuntimeException: Unable to create DataBlock
        at 
org.apache.pinot.query.runtime.blocks.TransferableBlock.getDataBlock(TransferableBlock.java:117)
 
~[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.query.runtime.blocks.TransferableBlockUtils.splitBlock(TransferableBlockUtils.java:73)
 
~[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.query.runtime.operator.MailboxSendOperator.sendDataTableBlockToServers(MailboxSendOperator.java:207)
 
~[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.query.runtime.operator.MailboxSendOperator.getNextBlock(MailboxSendOperator.java:146)
 
[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.query.runtime.operator.MailboxSendOperator.getNextBlock(MailboxSendOperator.java:50)
 
[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.core.operator.BaseOperator.nextBlock(BaseOperator.java:39) 
[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.query.runtime.executor.WorkerQueryExecutor$1.runJob(WorkerQueryExecutor.java:84)
 
[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
org.apache.pinot.core.util.trace.TraceRunnable.run(TraceRunnable.java:40) 
[pinot-all-0.12.0-SNAPSHOT-jar-with-dependencies.jar:0.12.0-SNAPSHOT-2f640ff8683728b844be9e045d5ce0f026d09e71]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]
   Caused by: java.lang.ClassCastException
   ```


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