gianm opened a new pull request, #13888:
URL: https://github.com/apache/druid/pull/13888

   This function is notorious for causing memory exhaustion and excessive CPU 
usage; so much so that it was valuable to work around it in the SQL planner in 
#13206. Hopefully, a warning comment will encourage developers to stay away and 
come up with solutions that do not involve computing all possible buckets.
   
   More recently, #13706 introduced some new logic that uses this problematic 
method, which causes certain `REPLACE` statements to run out of memory 
materializing large numbers of buckets. This will need to be fixed separately.


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