zhaih commented on issue #12358:
URL: https://github.com/apache/lucene/issues/12358#issuecomment-1595284895

   After roughly catching up with the threads, I would like to go back to
   > +1 to update the Weight#count API contract or introduce a new API to 
better optimize counting.
   
   So we probably can have two count API, `constantCount` and `fastCount`? 
   Then the contract can become, IS will call `constantCount` first, then if:
   * it returns `-2` then it means there's no possible constant time count, but 
a possible faster than normal count, then IS will call `fastCount` to retrieve 
count; 
   * it returns `-1` then it means no faster count possible, go back to use 
query and do count normally?
   * it returns a natural number then it's the count.
   
   Does that makes sense?
   


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