Jackie-Jiang commented on PR #15610:
URL: https://github.com/apache/pinot/pull/15610#issuecomment-2822476703

   Let's hold off a little bit on this PR. In the long term we want to move to 
standard (PostgreSQL) behavior, so the question is how to provide smooth 
migration. Having a cluster config might not be enough for that purpose because 
we might need to have both behaviors supported at the same time so that user 
can switch from old query to new query. Using query option is also not ideal 
because if user can change the query and add a new option, they can directly 
switch to the new query.
   
   Regarding the mechanism in this PR, to reduce overhead of looking up config 
map within a map, we can init the operator table only when the config changes 
(via callback), then always use the same operator table at query time.


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