Function DecimalArrayFromJSON

cpp/src/arrow/compute/kernels/test_util_internal.h:77–84

Construct an array of decimals, where negative scale is allowed. Works around DecimalXXX::FromString intentionally not inferring negative scales.

// Works around DecimalXXX::FromString intentionally not inferring
// negative scales.
inline std::shared_ptr<Array> DecimalArrayFromJSON(const std::shared_ptr<DataType>& type,
                                                   const std::string& json) {
  const auto& ty = checked_cast<const DecimalType&>(*type);
  if (ty.scale() >= 0) return ArrayFromJSON(type, json);
  auto p = ty.precision() - ty.scale();
  auto adjusted_ty = ty.id() == Type::DECIMAL128 ? decimal128(p, 0) : decimal256(p, 0);
  return Cast(ArrayFromJSON(adjusted_ty, json), type).ValueOrDie().make_array();
}

inline std::shared_ptr<Scalar> DecimalScalarFromJSON(
    const std::shared_ptr<DataType>& type, const std::string& json) {