Postgres Rewritten in Rust Passes 100% of Regression Tests

A developer's experimental rewrite of PostgreSQL in Rust, called pgrust, now passes 46,000+ regression tests and runs in a browser via WebAssembly

A solo developer's experimental project to rewrite PostgreSQL in Rust has reached a striking milestone: pgrust now passes 100% of Postgres 18.3's regression test suite — all 46,000-plus queries.

Built by Michael Malis, the project lives at pgrust on GitHub and targets full compatibility with Postgres 18.3. It is disk-compatible with existing data directories. You can boot it from a standard Postgres data directory and run SQL directly in a browser via the WebAssembly demo

The project is not production-ready and isn't performance-optimized yet, but the roadmap hints at ambitions well beyond a port: multithreaded internals, built-in connection pooling, no-vacuum storage designs, runtime guardrails for AI-generated SQL, and fewer sudden bad-plan switches.

The Postgres community took notice — the Hacker News discussion drew 389 points and nearly 400 comments, with developers debating whether Rust's safety guarantees make a compelling case for rewriting foundational infrastructure. Most agreed pgrust is an impressive proof of concept even if production Postgres isn't going anywhere.

For now, the project ships under AGPL-3.0 and accepts community contributions. A Docker image is available for anyone who wants to kick the tires.