heydoriszhang commented on issue #11866:
URL: https://github.com/apache/pinot/issues/11866#issuecomment-1788039040

   @Jackie-Jiang , we have a lot of existing customers using this kind of query 
and asking them to rewrite the query takes non-trivial effort. This is blocking 
our Pinot 0.12 version upgrade in Uber.
   
   Could we safely revert #9605 or make minimum change to keep the old behavior 
in 0.12+ release while working with customers to migrate the queries for the 
long run?
   Also it seems in current master branch, using the multi-stage engine will 
work with the old behavior on the non aggregation group by, is this intended? 
In 0.12.1 this will not work for multi-stage engine either. Does anyone know 
which PR made multi-stage engine working with the old behavior?
   


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