rmuir commented on pull request #477:
URL: https://github.com/apache/lucene/pull/477#issuecomment-981738439


   Let's fix the CHANGES now that it works with deleted documents.
   
   I'm sad the optimization couldnt work because of a crazy corner case: which 
begs the question, why does the user care about corner cases of Norms? 
Shouldn't that be a implementation detail? e.g., should we deprecate this 
`NormsExistQuery`, and create a `TokensExistQuery` in its place, that has both 
this optimization, and the docCount-based opto (when there are no deleted 
docs). It would be faster, so I'd love to know the use-case where the user 
actually cares about low-level stuff like norms.


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