Developer Solves 8-Week-Old DuckDB PR Failure in 70 Minutes Using AI Agents

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A developer spent eight weeks waiting on a stalled pull request to add gpudb, a GPU-accelerated DuckDB extension supporting NVIDIA CUDA and Apple Silicon Metal, to the DuckDB community-extensions registry. The sole failing CI job was labelled linux_arm64, leading to an initial assumption of an ARM-specific issue, but the actual error was a missing Makefile target unrelated to the platform. The arm64 runner had simply reached the failing step first, triggering a fail-fast that cancelled all other platform jobs before they could surface the same error. The fix involved adopting the C-API extension route — vendoring DuckDB headers and integrating the correct CI build harness — rather than rewriting the project into DuckDB's standard C++ extension template. By running the community-extensions build workflow manually on a personal fork via GitHub CLI, the developer was able to verify the fix across all four platforms without waiting for maintainer approval.

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