mapleFU commented on issue #35606:
URL: https://github.com/apache/arrow/issues/35606#issuecomment-1553254203
```c++
// Common tests for Decimal128::FromReal(T, ...) and Decimal256::FromReal(T,
...)
template <typename T>
class TestDecimalFromReal : public ::testing::Test {
public:
using Decimal = typename T::first_type;
using Real = typename T::second_type;
using ParamType = FromRealTestParam<Real>;
void TestSuccess() {
const std::vector<ParamType> params{
// clang-format off
{0.0f, 1, 0, "0"},
{-0.0f, 1, 0, "0"},
{0.0f, 19, 4, "0.0000"},
{-0.0f, 19, 4, "0.0000"},
{123.0f, 7, 4, "123.0000"},
{-123.0f, 7, 4, "-123.0000"},
{456.78f, 7, 4, "456.7800"},
{-456.78f, 7, 4, "-456.7800"},
{456.784f, 5, 2, "456.78"},
{-456.784f, 5, 2, "-456.78"},
{456.786f, 5, 2, "456.79"},
{-456.786f, 5, 2, "-456.79"},
{999.99f, 5, 2, "999.99"},
{-999.99f, 5, 2, "-999.99"},
{123.0f, 19, 0, "123"},
{-123.0f, 19, 0, "-123"},
{123.4f, 19, 0, "123"},
{-123.4f, 19, 0, "-123"},
{123.6f, 19, 0, "124"},
{-123.6f, 19, 0, "-124"},
// 2**62
{4.611686e+18f, 19, 0, "4611686018427387904"},
{-4.611686e+18f, 19, 0, "-4611686018427387904"},
// 2**63
{9.223372e+18f, 19, 0, "9223372036854775808"},
{-9.223372e+18f, 19, 0, "-9223372036854775808"},
// 2**64
{1.8446744e+19f, 20, 0, "18446744073709551616"},
{-1.8446744e+19f, 20, 0, "-18446744073709551616"}
// clang-format on
};
for (const ParamType& param : params) {
CheckDecimalFromReal<Decimal>(param.real, param.precision, param.scale,
param.expected);
}
}
```
Here meets:
```c++
// 2**62
{4.611686e+18f, 19, 0, "4611686018427387904"},
{-4.611686e+18f, 19, 0, "-4611686018427387904"},
// 2**63
{9.223372e+18f, 19, 0, "9223372036854775808"},
{-9.223372e+18f, 19, 0, "-9223372036854775808"},
// 2**64
{1.8446744e+19f, 20, 0, "18446744073709551616"},
{-1.8446744e+19f, 20, 0, "-18446744073709551616"}
```
These values would be truncated on MinGW when type is `float`
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