Apache Data Lakehouse Weekly: July 21 to July 29, 2026

Short summary

A weekly roundup covering Apache lakehouse ecosystem governance and spec debates. Iceberg V4 debates deprecating equality deletes in favor of writer-maintained position indexes, with strong support from Ryan Blue. Parquet, Polaris, Arrow, and the REST catalog spec all saw consequential votes and discussions around formalizing contracts.

• •Iceberg V4 debates deprecating equality deletes; Ryan Blue argues writers should maintain position indexes instead
• •REST catalog OpenAPI expression schemas aligned with Iceberg spec via formal vote
• •Polaris pulled 1.7.0 release candidate due to licensing gap in 44 staged jars

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