Function TupleRangeFromTable

cpp/src/arrow/stl.h:461–488

template <typename Range>
Status TupleRangeFromTable(const Table& table, const compute::CastOptions& cast_options,
                           compute::ExecContext* ctx, Range* rows) {
  using row_type = typename std::decay<decltype(*std::begin(*rows))>::type;
  constexpr std::size_t n_columns = std::tuple_size<row_type>::value;

  if (table.schema()->num_fields() != n_columns) {
    return Status::Invalid(
        "Number of columns in the table does not match the width of the target: ",
        table.schema()->num_fields(), " != ", n_columns);
  }

  if (std::size(*rows) != static_cast<size_t>(table.num_rows())) {
    return Status::Invalid(
        "Number of rows in the table does not match the size of the target: ",
        table.num_rows(), " != ", std::size(*rows));
  }

  // Check that all columns have the correct type, otherwise cast them.
  std::shared_ptr<Table> table_owner;
  std::reference_wrapper<const ::arrow::Table> current_table(table);

  ARROW_RETURN_NOT_OK(internal::EnsureColumnTypes<row_type>::Cast(
      table, &table_owner, cast_options, ctx, &current_table));

  internal::TupleSetter<Range, row_type>::Fill(current_table.get(), rows);

  return Status::OK();
}

}  // namespace stl
}  // namespace arrow