Sutou Kouhei

Can we add a CI job that only build documents and detect documentation related problems? (`make dist` is OK for it.) If it's true, we can introduce this.

Thanks for sharing a JRuby side opinion. I'll care about JRuby too for this feature.

FYI: There is another discussion this feature: https://gist.github.com/postmodern/4c0cbccc0c7eda4585db0fc5267cdd57 But there is no consensus in the discussion yet.

We need LLVM headers to use Gandiva. (Some public Gandiva headers use LLVM headers.) If we build PyArrow with Gandiva support, we need LLVM as a build-time dependency.

> CMake is easily able to find it based on that, but the custom (AFAICT) `findLLVMAlt` has it's own checks that fail to find it now (or need something more;...

Thanks. It seems that LLVM related packages are removed from pyarrow's host requirements: https://github.com/apache/arrow/pull/14102/files#diff-e1dc9dc44f82817c013424829588fc3fe48e63c78b42ce47e012016a243de09bL187-L189 Could you restore them?

@github-actions crossbow submit -g conda

I think that we don't need `clang` related but I'm not sure. Let's try.

https://dev.azure.com/ursacomputing/crossbow/_build/results?buildId=34819&view=logs&j=0da5d1d9-276d-5173-c4c4-9d4d4ed14fdb&t=d9b15392-e4ce-5e4c-0c8c-b69645229181&l=3847 ```text Could NOT find LLVMAlt (missing: CLANG_EXECUTABLE) ``` `clang` is needed for our `FindLLVMAlt.cmake`. (`LLVMConfig.cmake` doesn't require it.) Could you add `clang` too for now?

I think that this is related to MSYS2: * https://github.com/msys2/MINGW-packages/pull/13618 * https://github.com/msys2/MINGW-packages/pull/13619 * https://github.com/msys2/MINGW-packages/pull/13620 BTW... @zeroshade How did you generate the error messages!? I want to know how to detect...