Openduck Distributed Duckdb

This is an open-source distributed DuckDB implementation that gives you remote database attach, hybrid query execution, and differential storage without MotherDuck's pricing. The architecture is clean: a gRPC gateway splits queries between local and remote workers, so a single SQL join can pull from your laptop and a remote cluster transparently. It's built in Rust with a C++ DuckDB extension, uses Postgres for metadata and object storage for sealed layers, and the hybrid execution model is genuinely clever. Setup requires building both the Rust backend and the extension, which is not trivial but well-documented. If you want MotherDuck's capabilities self-hosted or need fine-grained control over query execution boundaries, this is worth the compile time.