Method ExtensionEquals

python/pyarrow/src/arrow/python/extension_type.cc:101–136

      type_instance_(inst) {}

bool PyExtensionType::ExtensionEquals(const ExtensionType& other) const {
  PyAcquireGIL lock;

  if (other.extension_name() != extension_name()) {
    return false;
  }
  const auto& other_ext = checked_cast<const PyExtensionType&>(other);
  int res = -1;
  if (!type_instance_) {
    if (other_ext.type_instance_) {
      return false;
    }
    // Compare Python types
    res = PyObject_RichCompareBool(type_class_.obj(), other_ext.type_class_.obj(), Py_EQ);
  } else {
    if (!other_ext.type_instance_) {
      return false;
    }
    // Compare Python instances
    OwnedRef left(GetInstance());
    OwnedRef right(other_ext.GetInstance());
    if (!left || !right) {
      goto error;
    }
    res = PyObject_RichCompareBool(left.obj(), right.obj(), Py_EQ);
  }
  if (res == -1) {
    goto error;
  }
  return res == 1;

error:
  // Cannot propagate error
  PyErr_WriteUnraisable(nullptr);
  return false;
}

std::shared_ptr<Array> PyExtensionType::MakeArray(std::shared_ptr<ArrayData> data) const {
  ARROW_DCHECK_EQ(data->type->id(), Type::EXTENSION);