Hi all, Sung and I each started a thread on this recently [1][2], and together with Andrei the discussion converged on a single design.
We've merged them into one proposal: a standalone, language-neutral repository of conformance fixtures - starting with static inputs paired with the expected value the spec fixes - modeled on parquet-testing, so each implementation checks its reading of the spec against a shared set instead of only against itself. There are working POCs: Sung's iceberg-testing fork [3] with pyiceberg [4] and iceberg-rust [5], and iceberg-go's engine-free variant checks [6]. Document: [Proposal <https://docs.google.com/document/d/1Qr82hccxJhWxKRT7B-3ylhOLSaJTYfc7hU51-mhzK6Y/edit?usp=sharing> ] The plan: start with the smallest primitives (type strings, transforms), grow outward to binary fixtures; no harness and no central gate - each implementation pins the repo and asserts in its own suite; Java and Go first, covering v2 and v3. Feedback welcome on this and happy to set up a short sync for anyone who wants to dig in. Thanks, Neelesh, Sung, Andrei [1] https://lists.apache.org/thread/964630c6q0jovs579x1jzb1t0o19jgjg [2] https://lists.apache.org/thread/87cvl9gk0cjk1of7jh3nvm4lzvzxnc8m [3] https://github.com/sungwy/iceberg-testing [4] https://github.com/sungwy/iceberg-python/pull/1 [5] https://github.com/sungwy/iceberg-rust/pull/2 [6] https://github.com/apache/iceberg-go/pull/1238
