shubhamvishu commented on issue #15561:
URL: https://github.com/apache/lucene/issues/15561#issuecomment-3761836574

   > Either we should have something called "approximate cost" and it's cheap 
and keep cost or switch the implementation to not fully realize the bitset
   
   @benwtrent I see! So you're suggesting we use `iterator.cost()` in `#cost` 
to get a cheaper (though approximate) estimate, and defer realizing the bitset 
until `#bits` is called? That tradeoff makes sense to me, it keeps cost checks 
lightweight for users.


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