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Adrien Grand commented on LUCENE-9614: -------------------------------------- Yes, caching relies on it though we always use rewritten queries as cache keys so I might be over-zealous as it doesn't look like what you are considering would be worse than all the rewrite methods we have that select terms to keep based on global index statistics. > Implement KNN Query > ------------------- > > Key: LUCENE-9614 > URL: https://issues.apache.org/jira/browse/LUCENE-9614 > Project: Lucene - Core > Issue Type: New Feature > Reporter: Michael Sokolov > Priority: Major > > Now we have a vector index format, and one vector indexing/KNN search > implementation, but the interface is low-level: you can search across a > single segment only. We would like to expose a Query implementation. > Initially, we want to support a usage where the KnnVectorQuery selects the > k-nearest neighbors without regard to any other constraints, and these can > then be filtered as part of an enclosing Boolean or other query. > Later we will want to explore some kind of filtering *while* performing > vector search, or a re-entrant search process that can yield further results. > Because of the nature of knn search (all documents having any vector value > match), it is more like a ranking than a filtering operation, and it doesn't > really make sense to provide an iterator interface that can be merged in the > usual way, in docid order, skipping ahead. It's not yet clear how to satisfy > a query that is "k nearest neighbors satsifying some arbitrary Query", at > least not without realizing a complete bitset for the Query. But this is for > a later issue; *this* issue is just about performing the knn search in > isolation, computing a set of (some given) K nearest neighbors, and providing > an iterator over those. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org