adding rerank

[xav-db]

Greptile Overview

Updated On: 2025-10-11 00:03:03 UTC

Greptile Summary

This PR introduces comprehensive documentation for reranking functionality in HelixDB, a new feature that enhances search result quality through post-processing algorithms. The changes add documentation for two reranking strategies: RerankRRF (Reciprocal Rank Fusion) for combining multiple search results and RerankMMR (Maximal Marginal Relevance) for diversifying results. The documentation follows established patterns in the codebase with detailed examples across multiple SDKs (Python, Rust, Go, TypeScript), mathematical formulas, best practices, and practical use cases. This feature expands HelixDB's capabilities beyond basic vector/keyword search to include sophisticated result ranking and diversification, which is valuable for AI/RAG applications where result quality and diversity are crucial.

Important Files Changed

Changed Files

Filename	Score	Overview
documentation/hql/rerankers/overview.mdx	5/5	Added comprehensive overview documentation for rerankers with clear usage patterns and chaining examples
documentation/hql/rerankers/rerank-rrf.mdx	5/5	Added complete documentation for RerankRRF (Reciprocal Rank Fusion) with multi-SDK examples
documentation/hql/rerankers/rerank-mmr.mdx	5/5	Added extensive documentation for RerankMMR (Maximal Marginal Relevance) with 971 lines of content
documentation/hql/rerankers/overview copy.mdx	2/5	Duplicate file that appears to be an accidental copy and should be removed
docs.json	4/5	Added rerankers navigation group but missing links to individual reranker documentation pages

Potential Issues:

• The file overview copy.mdx is a duplicate that should be removed before merging
• The docs.json navigation only includes the overview page but not the specific rerank-rrf.mdx and rerank-mmr.mdx pages, making them inaccessible through navigation
• The RRF documentation shows parameter k as both integer and float in examples, which could cause confusion about the expected type

Confidence Score: 4/5 - Well-structured documentation with comprehensive examples, but contains navigation issues and duplicate files that need attention.

Sequence Diagram

sequenceDiagram
    participant User
    participant Client as "HelixDB Client"
    participant DB as "HelixDB"
    participant Engine as "Search Engine"
    participant Reranker as "Rerank Engine"

    User->>Client: "Execute search query with reranking"
    Client->>DB: "Send HQL query (SearchV + RerankRRF/MMR)"
    DB->>Engine: "Perform initial vector search"
    Engine-->>DB: "Return candidate results (100-200)"
    DB->>Reranker: "Apply reranking algorithm"
    Note over Reranker: RRF: Combine rankings using<br/>reciprocal rank fusion<br/>MMR: Diversify using<br/>maximal marginal relevance
    Reranker-->>DB: "Return reranked results"
    DB->>DB: "Apply RANGE limit (top 10-20)"
    DB-->>Client: "Return final ranked results"
    Client-->>User: "Display reranked search results"

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[greptile-apps]

_{5 files reviewed, 2 comments}

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[greptile-apps]

style: This appears to be a duplicate file - the filename includes 'copy' which suggests it may be unintentional. Consider removing this file if documentation/hql/rerankers/overview.mdx contains the same content.

Prompt To Fix With AI

This is a comment left during a code review.
Path: documentation/hql/rerankers/overview copy.mdx
Line: 1:1

Comment:
**style:** This appears to be a duplicate file - the filename includes 'copy' which suggests it may be unintentional. Consider removing this file if documentation/hql/rerankers/overview.mdx contains the same content.

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

style: Only includes overview page but PR contains rerank-mmr.mdx and rerank-rrf.mdx files that aren't referenced here

Prompt To Fix With AI

This is a comment left during a code review.
Path: docs.json
Line: 107:114

Comment:
**style:** Only includes overview page but PR contains rerank-mmr.mdx and rerank-rrf.mdx files that aren't referenced here

How can I resolve this? If you propose a fix, please make it concise.