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Polars only ships cp310-abi3 wheels, which are not loadable under the free-threaded CPython the repo targets (.python-version = 3.14t). uv therefore builds the ~3 MB Rust sdist from source on every uv.lock change, making CI builds very slow. Upstream (pola-rs/polars#27955) is not yet ready to publish free-threaded wheels. Remove polars from pyproject.toml and relock (uv sync --upgrade && uv lock). No source files import polars, so nothing else changes.
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As discussed in #15395.
Polars only ships `cp310-abi3` wheels, and abi3/stable-ABI wheels are not loadable under free-threaded CPython. Because the repo targets `3.14t` (`.python-version`), uv cannot use a wheel for polars and falls back to compiling the ~3 MB Rust sdist from source. That rebuild fires on every `uv.lock` change and is what has been slowing the build.
Upstream is not yet ready to publish free-threaded wheels (pola-rs/polars#27955), so this reverts the Polars dependency until they do.
Changes:
No source files import `polars`, so nothing else is affected. When `polars-runtime` starts shipping `cp314t` wheels we can re-add it.
Closes #15395