Google Summer of Code 2023 - Polygon Geo Filter for Qdrant

Google Summer of Code 2023 contributor Zein Wen added polygon-based geographic filtering to Qdrant, enabling vector search queries to restrict results to irregular geographic areas that circles and rectangles cannot accurately represent. The implementation builds on Qdrant’s geohash index, which first identifies rectangular cells that may overlap a polygon and then verifies whether candidate points lie within its boundaries, reducing the need to inspect every stored location. Development required validating polygon-rectangle intersection and point-in-polygon operations from Rust’s geo library, including investigation of winding-number and ray-casting approaches and edge-case testing. Although GeoJSON and a dedicated multi-polygon filter were considered, the project retained an API consistent with Qdrant’s existing geographic filters, while allowing multiple polygon conditions to be combined. The work also gave Wen experience contributing production Rust code, collaborating through review, and balancing familiar standards with API simplicity and user needs.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.