The open lakehouse stack spent this week arguing about what belongs in a spec and what belongs in a release. Iceberg contributors opened a formal push to remove equality deletes from the V4 spec, Parquet closed its vote on a brand new File logical type, and Polaris wrestled with how much consistency its persistence layer owes its users. Underneath the design debates, release trains kept moving: Iceberg Rust, an Iceberg Terraform provider, Arrow JS, Arrow Rust Object Store, DataFusion, Ballista, and Comet all had votes in flight. This is a week where the community showed both sides of its personality, big structural bets for the future and steady, unglamorous shipping for the present.
By the numbers, the six dev lists carried 268 messages across roughly 80 distinct threads in the past week. Polaris led with 84 messages, Iceberg followed at 71, Parquet posted 51, DataFusion 26, Arrow 20, and the young Ossie project added 16. Those raw counts undersell the range: the week included two format-level votes, five release candidates, one new committer, a persistence redesign proposal, and at least four threads that will shape spec decisions months from now. Grab a coffee. There is a lot to cover.
