[C++] arrow::compute::Function::default_options() returns nullptr for "rank" on Ubuntu

[tikkss]

Describe the bug, including details regarding any error messages, version, and platform.

Steps to reproduce:

Run the following program on Ubuntu (reproduced on Ubuntu 24.04 using the official packages):

// g++ -g3 -O0 a.cc $(pkgconf --cflags --libs arrow) && ./a.out
#include <stdio.h>
#include <arrow/compute/api.h>

int
main(void)
{
	auto func = *(arrow::compute::GetFunctionRegistry()->GetFunction("rank"));
	printf("%p\n", func->default_options()->options_type());
	return 0;
}

Expected result:

A valid pointer to a FunctionOptions object, specifically arrow::compute::RankOptions.

Actual result:

Returns nullptr.

Environments:

• Arrow version: 20.0.0
• OS: Ubuntu 24.04 (Debian noble)
• This does not reproduce on other platforms.

Component(s)

C++

[kou]

It seems that arrow::compute::RankOptions::Defaults() may be called

arrow/cpp/src/arrow/compute/kernels/vector_rank.cc

Line 386 in 81bb988

static inline const auto kDefaultOptions = RankOptions::Defaults();

before arrow::compute::internal::kRankOptionsType is initialized

arrow/cpp/src/arrow/compute/api_vector.cc

Lines 154 to 157 in 81bb988

	static auto kRankOptionsType = GetFunctionOptionsType<RankOptions>(
	DataMember("sort_keys", &RankOptions::sort_keys),
	DataMember("null_placement", &RankOptions::null_placement),
	DataMember("tiebreaker", &RankOptions::tiebreaker));

.

arrow::compute::internal::kRankOptionsType is used in arrow::compute::RankOptions::RankOptions() that is used by RankOptions::Defaults():

arrow/cpp/src/arrow/compute/api_vector.cc

Line 237 in 81bb988

: FunctionOptions(internal::kRankOptionsType),

@pitrou @bkietz Do you know whether there is the static variable initialization order specification for C++ or not?

[kou]

Issue resolved by pull request 46303
#46303