gianm commented on pull request #12291:
URL: https://github.com/apache/druid/pull/12291#issuecomment-1062035054


   I'm trying to understand where we'd be after this patch. What algorithm will 
be used in each of the following cases?
   
   - string dimension, no dictionary <-- i.e., what we get from an expression 
that isn't backed by a single dictionary-coded string column
   - string dimension, dictionary coded, unique (1-1 mapping from keys -> 
values) <-- i.e., what we get from a regular column in a segment, or a 
dictionary-coded string column plus an ExtractionFn that is `ONE_TO_ONE`
   - string dimension, dictionary coded, nonunique <-- i.e., what we get from 
an expression backed by a single dictionary-coded string column, or a 
dictionary-coded string column plus an ExtractionFn that is `MANY_TO_ONE`


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