Chroma used DuckDB at some point, might not be the case anymore though
Doesn't DuckDB already do vector search?
They do have an extension for vector similarity search (https://duckdb.org/docs/extensions/vss).
But Milvius might propose more features, as they have been in this specific space for longer.
We have seen similar products in the olap space, as well, ie. Clickhouse local.