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Filtered Vector Search

54 posts · Feb 2023 – Sep 2026

What this trail covers

Qdrant continues to enhance its filtered vector search capabilities by introducing and benchmarking the ACORN algorithm alongside its existing Filterable HNSW approach. This post details the performance trade-offs between these methods, particularly for scenarios involving single and double keyword filters, and highlights the effectiveness of the query planner in selecting the optimal strategy (ACORN, Filterable HNSW, or payload index fallback) based on filter selectivity and query budget. ACORN now supports hybrid search with keyword matching and structured filters, enabling precise job matching for large datasets. Himalayas uses this to combine semantic similarity with filters for location, time zone, and employment type, achieving high recall and low latency.

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