GH-50043: [C++][Python] Fix hash_any/hash_all on sliced boolean arrays

[fenfeng9]

Rationale for this change

hash_any and hash_all could return incorrect results for sliced nullable boolean arrays.

The validity bitmap used the slice offset, but the boolean values bitmap did not.

What changes are included in this PR?

Apply the slice offset when reading boolean values in hash_any / hash_all.

Add C++ and Python regression tests.

Are these changes tested?

Yes.

Are there any user-facing changes?

No.

• GitHub Issue: [C++][Python] hash_any/hash_all produce incorrect results on sliced boolean arrays #50043

[github-actions]

⚠️ GitHub issue #50043 has been automatically assigned in GitHub to PR creator.

[rok]

Thanks for doing this @fenfeng9 !
A minor C++ nit from my side.

[rok]

I wonder if we have the same bug elsewhere in aggregate kernels (e.g. for different types). It's out of scope here, but do you have any input @fenfeng9 ?

[fenfeng9]

I wonder if we have the same bug elsewhere in aggregate kernels (e.g. for different types). It's out of scope here, but do you have any input @fenfeng9 ?

I don't see the same kind of offset issue in nearby aggregate kernels for other data types.

I'll take a closer look separately, and if I find another case, I'll file a new issue.

[rok]

I wonder if we have the same bug elsewhere in aggregate kernels (e.g. for different types). It's out of scope here, but do you have any input @fenfeng9 ?

I don't see the same kind of offset issue in nearby aggregate kernels for other data types.

I'll take a closer look separately, and if I find another case, I'll file a new issue.

Perfect, thank you!

This looks good to me now. Will merge if green.

[fenfeng9]

I wonder if we have the same bug elsewhere in aggregate kernels (e.g. for different types). It's out of scope here, but do you have any input @fenfeng9 ?

I don't see the same kind of offset issue in nearby aggregate kernels for other data types.
I'll take a closer look separately, and if I find another case, I'll file a new issue.

Perfect, thank you!

This looks good to me now. Will merge if green.

Thank you for your quick and patient review.

[rok]

Thanks again @fenfeng9!