Method FromChunkedStructArray

cpp/src/arrow/table.cc:324–347

}

Result<std::shared_ptr<Table>> Table::FromChunkedStructArray(
    const std::shared_ptr<ChunkedArray>& array) {
  auto type = array->type();
  if (type->id() != Type::STRUCT) {
    return Status::Invalid("Expected a chunked struct array, got ", *type);
  }
  int num_columns = type->num_fields();
  int num_chunks = array->num_chunks();

  const auto& struct_chunks = array->chunks();
  std::vector<std::shared_ptr<ChunkedArray>> columns(num_columns);
  for (int i = 0; i < num_columns; ++i) {
    ArrayVector chunks(num_chunks);
    std::transform(struct_chunks.begin(), struct_chunks.end(), chunks.begin(),
                   [i](const std::shared_ptr<Array>& struct_chunk) {
                     return static_cast<const StructArray&>(*struct_chunk).field(i);
                   });
    columns[i] =
        std::make_shared<ChunkedArray>(std::move(chunks), type->field(i)->type());
  }

  return Table::Make(::arrow::schema(type->fields()), std::move(columns),
                     array->length());
}

std::vector<std::string> Table::ColumnNames() const {
  std::vector<std::string> names(num_columns());