Previously proprietary PostgreSQL extension is now freely available on GitHub.

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Tiger Data has open-sourced pg_textsearch, a PostgreSQL extension that enables BM25 relevance-ranked keyword searches directly within PostgreSQL. Previously available only on Tiger Cloud, the extension is now released under The PostgreSQL License on GitHub. It supports 29+ languages, works with partitioned tables, and uses a memtable architecture for efficient indexing. The extension allows developers to run modern search capabilities without setting up external systems like Elasticsearch, and can be combined with pgvector for hybrid keyword and semantic search within a single database.

Watch Out Elasticsearch! Tiger Data's PostgreSQL BM25 Search Extension Goes Open Source