walterddr opened a new pull request, #10211:
URL: https://github.com/apache/pinot/pull/10211

   some of the operators in v2 engine are actually singleton instance stages 
such as 
   - global agg ` SELECT COUNT(*) FROM tbl` or 
   - global sort `SELECT col FROM tbl ORDER BY col`
   
   there's no reason to run them on multiple instances which we currently do. 
the current implementation works b/c
   - all but one instances is actually processing data
   - all remaining instances will process pass-through end-of-stream blocks and 
thus contribute nothing to the final results.
   
   This PR allows these operator to run on a random singleton server
   


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