Alessandro Benedetti created SOLR-18267:
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Summary: Skip HSNW graph construction for exact vector search
Key: SOLR-18267
URL: https://issues.apache.org/jira/browse/SOLR-18267
Project: Solr
Issue Type: New Feature
Components: vector-search
Reporter: Alessandro Benedetti
The idea we are exploring is not building the HNSW graph in the case of a
highly selective filter search use case, and performing brute force KNN
comparison as a post-filter.
The goal behind the feature is to not pay the cost of HNSW building during
ingestion when ANN search isn't used.
A collaborator of ours already created a proof-of-concept on a branch of
upstream Solr that adds knnAlgorithm="flat" to DenseVectorField using
Lucene99FlatVectorsFormat. This stores vectors in the index (.vec/.vemf files)
without building the HNSW graph (.vex/.vem files).
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