Comet 1.0.0 Blog Post - #201
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Incorporates PRs merged to datafusion-comet main between 2026-07-17 and 2026-07-27, updates PR/contributor counts, and bumps DataFusion version to 54.1. Adds a new Shuffle Improvements section.
Remove inline PR links throughout, compress long enumerations into grouped lists, and consolidate the Iceberg / correctness / config sections into shorter prose. The change log link at the top is now the pointer for per-PR detail.
Replace the full enumeration of ~30 correctness fixes with a stat, two representative examples (whitespace trimming, ANSI short-circuit), and a short note on conservative fallbacks. Full list stays in the change log.
Replace the generic "A 1.0 release is only as good as its results" opener with concrete framing: correctness fixes have been part of every release, and 1.0 was an extra push to clear the bulk of the known issues.
Sketch the arc of the project across five threads — query coverage, Spark support, ecosystem, correctness rigor, and performance — grounded in concrete facts from earlier releases (106 → 404 expressions, JVM codegen dispatcher in 0.17.0, Iceberg in 0.10.0, 9% TPC-DS gain in 0.17.0). Trim the "What 1.0 Means" intro since the arc is now covered above.
Corrected the number of major releases from nineteen to sixteen and updated the supported expressions count to more than 400 in version 1.0.0.
andygrove
commented
Aug 4, 2026
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| The Apache DataFusion PMC is pleased to announce version 1.0.0 of the [Comet](https://datafusion.apache.org/comet/) subproject. |
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