Jackie-Jiang opened a new pull request, #13591:
URL: https://github.com/apache/pinot/pull/13591

   Ensure all multi-stage operators follow the following contract:
   - Return error block whenever it received error block from upstream, or 
error occurred within the operator
   - Return non-empty data block until all data is returned
   - Return EOS block in the end, after which no more `nextBlock()` should be 
invoked


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