Function GetTypeForBuffers

cpp/src/arrow/util/align_util.cc:47–59

Returns the type that controls how the buffers of this ArrayData (not its children) should behave

// Returns the type that controls how the buffers of this ArrayData (not its children)
// should behave
Type::type GetTypeForBuffers(const ArrayData& array) {
  Type::type type_id = array.type->storage_id();
  if (type_id == Type::DICTIONARY) {
    // return index type id, provided by the DictionaryType array.type or
    // array.type->storage_type() if array.type is an ExtensionType
    DataType* dict_type = array.type.get();
    if (array.type->id() == Type::EXTENSION) {
      dict_type = checked_cast<ExtensionType*>(dict_type)->storage_type().get();
    }
    return checked_cast<DictionaryType*>(dict_type)->index_type()->id();
  }
  return type_id;
}

// Checks to see if an array's own buffers are aligned but doesn't check
// children