Apache Lakehouse Projects Debate Format Boundaries, Arrow 25.0.0 Ships

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During the week of July 16–23, 2026, major Apache data lakehouse projects generated 327 mailing list messages debating format design, releases, and governance. Iceberg contributors revived a proposal to deprecate equality deletes in V4, with Flink developers citing them as the top pain point for streaming use cases and outlining a path toward an engine-agnostic replacement. The Iceberg Rust implementation reached its 0.10.0 release, while a Terraform provider for Iceberg catalog management advanced to RC1, promising infrastructure-as-code control over namespaces and tables. Apache Arrow shipped its 25.0.0 release across all supported languages, and DataFusion welcomed a new committer alongside a fresh release. Broader discussions across Polaris, Parquet, and the incubating Ossie project reflected a maturing stack where debates have shifted from feature existence to the guarantees each layer owes the ones above it.

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