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Research: sparqlite: SPARQL 1.1 inside SQLite, written in Rust Simon Willison’s Weblog Newsletter 16th October 2026 Research sparqlite: SPARQL 1.1 inside SQLite, written in Rust — sparqlite is a Rust-based SQLite loadable extension that stores RDF quads in ordinary SQLite tables and executes SPARQL 1.1 queries and updates natively inside the SQLite process. Its integer-encoded terms, covering indexes, cost-based planner, batched joins, and optional direct SQLite B-tree reader deliver 3.5× speedups over SQL translation in count mode and 2.8× when returning full results, while passing 636 of 639 applicable W3C evaluation tests and millions of differential-fuzz… This research task is really an experiment in running Claude Code for web in "Ultracode" mode, as described in Orchestrate subagents at scale with dynamic workflows in the Claude Code documentation. With Ultracode turned on, Claude Code makes aggressive use of dynamic workflows - it generates JavaScript that defines and coordinates a network of subagents to take on complex problems. My initial prompt was this - I meant "hit the rows directly", the word "delete" was an accidental typo on my phone: Write a SQLite extension in Rust that implants SPARQL and runs really fast because it can hit the delete rows directly This caused Claude Code for web to churn for over 12 hours. I checked in on its progress the next day and sent a single follow-up prompt when I noticed how many Rust crates it had built: Every folder in the crates/ directory needs a README Include a tutorial.md teaching users how to install the extension and how to run it in the SQLite CLI and then teaching them SPARQL in addition to how to use the SQLite extension Include a script with the tutorial for populating a SQLite database with useful and realistic example data for that tutorial This project feels like next-level vibe coding - it's not remotely feasible to review the code that was produced here, and even following the documentation is a significant investment in work. I'm not entirely sure what to do with this - I appear to have a full SPARQL implementation in Rust inside SQLite now, but how valuable is that if I created it on a whim and can't (or won't) invest the necessary time to understand what it can do? Recent articles Battle Drones - a vibe coded RTS with audio-based multiplayer - 20th October 2026 Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026 A new feature for my blog, built using my voice - 9th October 2026 Claude Haiku 5.5 - 7th October 2026 This is a beat by Simon Willison, posted on 16th October 2026. rdf 7 semantic-web 17 sqlite 489 ai 2,288 rust 115 generative-ai 2,030 llms 1,996 coding-agents 262 claude-code 133 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026