Apache DataFusion Comet 1.0.0 ReleasePosted on: Fri 07 August 2026 by pmcThe Apache DataFusion PMC is pleased to announce version 1.0.0 of the Comet subproject. Comet is an accelerator for Apache Spark that translates Spark physical plans to DataFusion physical plans for improved performance and efficiency without requiring any code changes. Upstream Spark tests : Comet runs Spark's own test suite with Comet enabled, providing more than 24,000 unit tests effectively for free. : Comet runs Spark's own test suite with Comet enabled, providing more than 24,000 unit tests effectively for free. Native Expression Performance¶Many native expression implementations have been optimized to more efficiently leverage Arrow kernels or to avoid per-row builders.