andishgar commented on issue #47101:
URL: https://github.com/apache/arrow/issues/47101#issuecomment-3104803603
@kou Could we use inside arrow?
The resason why we need boost I try to depict to below code.
```c++
#include <iostream>
#include <variant>
#include <string>
#include <boost/variant2/variant.hpp>
namespace {
using ValueType = std::variant<int64_t, double, std::string>;
using ValueTypeSubset = std::variant<int64_t, double>;
// The api of ArrayStatistics will be like this
// Which I think it's not appropriate
ValueType ConvertToSuperSet(ValueTypeSubset value) {
return std::visit([&](auto v) {
return ValueType(v);
}, value);
}
}
int main() {
ValueType v;
ValueTypeSubset v1 = int64_t{1};
// Compile-time error
/* v = v1; */
// This is what the ArrayStatistics API might look like,
// though I don't think it's ideal.
v = ConvertToSuperSet(v1);
std::cout << std::get<int64_t>(v) << '\n';
boost::variant2::variant<int64_t, double, std::string> v2;
boost::variant2::variant<int64_t, double> v3 = int64_t{1};
// Using Boost enables this kind of API, which seems cleaner.
v2 = v3;
std::cout << boost::variant2::get<int64_t>(v2) << '\n';
}
```
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