Supporting Postgres Named Prepared Statements in Hyperdrive

Cloudflare’s Hyperdrive added support for PostgreSQL protocol-level named prepared statements across pooled connections, improving performance by enabling plan reuse without application changes. The post details how Hyperdrive buffers extended protocol messages (Parse, Bind, Execute, Sync, Describe), uses caching and transaction-mode pooling, and employs data structures (HashMap, LRU caches, VecDeque) to transparently manage statement preparation across different origin connections. It walks through four scenarios (parse/reuse × cache hit/miss) and outlines the trade-offs, such as occasional extra Parse injections and modest memory overhead, to maintain correctness and efficiency.