tursodatabase/libsql

Add vector_concat() and vector_slice() functions

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#2,136 opened on Jul 31, 2025

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enhancementhelp wanted

Description

Turso added vector_concat() and vector_slice(). Let's add them to libSQL too to retain compatibility: https://github.com/tursodatabase/turso/issues/2323

Contributor guide

Tech stack
csqlite
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C programmingSQLite internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Examine existing functions in libSQL's source, particularly any vector or aggregate functions, to understand how to add new SQL functions. Look at the Turso issue (https://github.com/tursodatabase/turso/issues/2323) for reference implementation. The implementation will likely involve adding entries to the function table in SQLite source files like func.c or a custom extension. Focus on the C code for parsing and executing vector concat and vector slice.