Reminds me of Anyblox, which is a columnar data-store file with attached wasm for encode/decode. Super fun read, showed up in the comments for Spiral. https://news.ycombinator.com/item?id=45212960#45214646

14 votes & no comments, 3 mo ago, for AnyBlox: A Framework for Self-Decoding Datasets [pdf] https://gienieczko.com/anyblox-paper https://news.ycombinator.com/item?id=44501743