Hello,
In the light of recent discussions, I've put up a very rough proposal of a Parquet 3 metadata format that allows both for light-weight file-level metadata and backwards compatibility with legacy readers. For the sake of convenience and out of personal preference, I've made this a PR to parquet-format rather than a Google Doc: https://github.com/apache/parquet-format/pull/242 Feel free to point any glaring mistakes or misunderstandings on my part, or to comment on details. Regards Antoine.
