DEdemilich·Aug 7, 2024
https://github.com/infiniflow/infinity, dense vector + sparse vector + fulltext search(BM25) + late interact reranker(Colbert)
In Full text search over Postgres: Elasticsearch vs. alternativesinfiniflow
infinity
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infiniflow / infinity
infinity
The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.
2Distinct people
5Mentions
0Explicit recommenders
4.8KGitHub stars
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What it is
The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.
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Where it is used
No documented product use has been verified yet.
What people are saying
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by week5 dated mentions
Observed mentions: 2024-04-29 13:05:53 UTC to 2024-08-07 13:31:01 UTC. Weeks start Monday, UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Apr 29 | 2024-04-29 00:00:00 UTC | 2024-05-06 00:00:00 UTC | 1 | 0 | 1 |
| May 6 | 2024-05-06 00:00:00 UTC | 2024-05-13 00:00:00 UTC | 0 | 0 | 0 |
| May 13 | 2024-05-13 00:00:00 UTC | 2024-05-20 00:00:00 UTC | 0 | 0 | 0 |
| May 20 | 2024-05-20 00:00:00 UTC | 2024-05-27 00:00:00 UTC | 0 | 0 | 0 |
| May 27 | 2024-05-27 00:00:00 UTC | 2024-06-03 00:00:00 UTC | 2 | 0 | 2 |
| Jun 3 | 2024-06-03 00:00:00 UTC | 2024-06-10 00:00:00 UTC | 0 | 0 | 0 |
| Jun 10 | 2024-06-10 00:00:00 UTC | 2024-06-17 00:00:00 UTC | 0 | 0 | 0 |
| Jun 17 | 2024-06-17 00:00:00 UTC | 2024-06-24 00:00:00 UTC | 0 | 0 | 0 |
| Jun 24 | 2024-06-24 00:00:00 UTC | 2024-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 1 | 2024-07-01 00:00:00 UTC | 2024-07-08 00:00:00 UTC | 0 | 0 | 0 |
| Jul 8 | 2024-07-08 00:00:00 UTC | 2024-07-15 00:00:00 UTC | 0 | 0 | 0 |
| Jul 15 | 2024-07-15 00:00:00 UTC | 2024-07-22 00:00:00 UTC | 1 | 1 | 0 |
| Jul 22 | 2024-07-22 00:00:00 UTC | 2024-07-29 00:00:00 UTC | 0 | 0 | 0 |
| Jul 29 | 2024-07-29 00:00:00 UTC | 2024-08-05 00:00:00 UTC | 0 | 0 | 0 |
| Aug 5 | 2024-08-05 00:00:00 UTC | 2024-08-12 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
5 sourcesShow HN: Infinity – Incredibly fast database for RAG with powerful hybrid search
Hybrid search of bm25,dense vector and sparse vector, and tensor based reranking(ColBERT).
Technology details:
https://medium.com/@infiniflowai/dense-vector-sparse-vector-...
2 points · Open discussionRRF is a simple and effective means of fused ranking for multiple recall.
Within our open source RAG product RAGFlow(https://github.com/infiniflow/ragflow), Elasticsearch is currently used instead of other general vector databases, because it can provide hybrid search right now. Under the default cases, embedding based reranker is not required, just RRF is enough, while even if reranker is used, keywords based retrieval is also a MUST to be hybridized with embedding based retrieval, that's just what RAGFlow's latest 0.7 release has provided.
On the other hand let me introduce another database we developed, Infinity(https://github.com/infiniflow/infinity), which can provide the hybrid search, you can see the performance here(https://github.com/infiniflow/infinity/blob/main/docs/refere...), both vector search and full-text search could perf
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orm much faster than other open source alternatives.
From the next version(weeks later), Infinity will also provide more comprehensive hybrid search capabilities, what you have mentioned the 3-way recalls(dense vector, sparse vector, keyword search) could be provided within single request.
Check https://github.com/infiniflow/infinity which combines vector search and full-text search providing extremely fast search performance.
In Tantivy – full-text search engine library inspired by Apache LuceneUse C++20 modules, take a look at this project: https://github.com/infiniflow/infinity
In Speeding up C++ build times