walterddr opened a new pull request, #11746:
URL: https://github.com/apache/pinot/pull/11746

   `MultiStageOperator`
   - [x] added `getMetadataBlock()` API which sets termination flag to true and 
propagate upstream.
   - [ ] any operator should only call `getMetadataBlock()` to return a 
successful EOS, it should not generate directly EOS via TransferrableBlockUtil 
anymore
   
   `Mailbox`es
   - [x] `SendingMailbox` and `ReceivingMailbox` now bear a contract to 
indicate whether early termination has occur from upstream (receiving --> 
sending)
   - [x] `ReceivingMailbox` uses early terminate flag to indicate backward 
signaling from `ReceiveOperator` 
   - [ ] `SendingMailbox` propagate the backward signaling to `SendingOperator`
   


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