gortiz commented on issue #19781:
URL: https://github.com/apache/pinot/issues/19781#issuecomment-6218280496

   Thanks for the review. Truncated bounds make sense. The pruners and the 
MinMax combine only need conservative bounds, so a prefix as lower bound and an 
incremented prefix as upper bound work for them. Some consumers need the exact 
value (a future non-null MIN/MAX without a scan, for example), so I would mark 
truncated values with a separate key. The increment must also follow the 
comparator that Pinot uses for STRING and BYTES, including the carry when the 
last character is already the maximum.
   
   Today `minValue` and `maxValue` have the same limit and are simply dropped. 
So I would do this as a follow-up that covers the existing keys and the new 
ones together, after the first PR. I added it as point 7 in the PR plan above. 
The first PR keeps "no keys" for values that are too long.
   
   On the config: agreed. A server-level default with a table-level override, 
as `columnMinMaxValueGeneratorMode` does today.
   


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