stephencelis/SQLite.swift

Add column weights to FTS order by Rank

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#1016 opened on Jul 30, 2020

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 (6 comments) (1 reaction) (0 assignees)Swift (10,145 stars) (1,618 forks)batch import
enhancementhelp wanted

Description

As far as I can tell, you can't currently run a Full-text search and order by rank in SQLite.swift.

SELECT * FROM fts WHERE fts MATCH ? ORDER BY bm25(fts);
SELECT * FROM fts WHERE fts MATCH ? ORDER BY rank;

Is this feature currently available? If not, how do we order the results of a Full-text search by relevance? Is there currently a workaround?

Contributor guide

Tech stack
swiftsql
Domain
database
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
SwiftSQLite FTS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Review the existing FTS support in SQLite.swift, particularly in the FTS extension files. Check if ordering by rank is already possible via the query builder. If not, explore adding a method like `orderByRank()` that takes optional column weights. Look at SQLite documentation for the `bm25` and `rank` functions. The issue comments may contain further discussion or workarounds.