weixiangsun commented on pull request #8029:
URL: https://github.com/apache/pinot/pull/8029#issuecomment-1053738973


   > High level question: Since the gap-fill is always processed on the broker 
side, will it be simpler if we always rewrite the query on the broker side to 
trim off the gap-fill part, so that no change is required on the server side? 
Another benefit of this approach is that this can eliminate the overhead of 
parsing sub-queries and processing gap-fill again on the servers.
   
   If the gap-fill part is trimmed off, it is hard to tell if this is gapfill 
query in case of Gapfill Type query. We do not parse the sub-queries and 
processing gap-fill again on servers. 


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