Apache Data Lakehouse Weekly: April 16–22, 2026

Two weeks past the Iceberg Summit, the San Francisco in-person alignments are now translating into formal proposals and code on the dev lists. Iceberg's V4 design work continued consolidating, Polaris kept moving toward its 1.4.0 milestone, Parquet's Geospatial spec picked up a cleanup commit from a new contributor, and Arrow's release engineering and Java modernization discussions stayed active. Apache Iceberg The post-summit V4 design work continued as the defining thread on the Iceberg dev li