tursodatabase/turso

Incremental computation

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#2,350 opened on Jul 30, 2025

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enhancementhelp wanted

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Description

I did a proof of concept of using DBSP for incremental view maintenance:

https://github.com/penberg/limbo/tree/incremental

However, we can apply DBSP much more broadly than that. For example, we could do query subscriptions:

conn.observe("SELECT * FROM users WHERE active = 1", |row| {
    let id: i32 = row.get("id").unwrap();
    let name: String = row.get("name").unwrap();
    println!("User {} with id {}", name, id);
});

but also probably triggers.

Although I wrote everything from scratch, we should probably just use the https://crates.io/crates/dbsp crate.

Contributor guide

Research direction
Study the existing proof of concept in the 'incremental' branch to understand the current approach. Then investigate the dbsp crate documentation and examples to see how to integrate it for incremental view maintenance. Focus on implementing query subscriptions and triggers as described. Consider performance implications and compatibility with Turso's architecture.
Tech stack
rust
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
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.
Mostly clear
Prerequisites
RustDBSP
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30