[GitHub] [lucene] agorlenko commented on pull request #11946: add similarity threshold for hnsw

[GitBox <gi...@apache.org>]

agorlenko commented on PR #11946:
URL: https://github.com/apache/lucene/pull/11946#issuecomment-1340151458

   I've done some experiments with real data and it seems that it really doesn't work as I expected. If number of docs which exceed threshold is significant (for example 20% or more of previously accepted docs), the query works slow and it is better to perform exact search. And unfortunately it happens quite often. 
   
   So I agree with @msokolov and I think I should rewrite this PR with post-filtering approach. It allows us to preserve predictable performance and not modify LeafReader/IndexReader (just filter TopDocs in KnnVectorQuery).


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