Function Table__cast

r/src/compute.cpp:50–65

[[arrow::export]]

// [[arrow::export]]
std::shared_ptr<arrow::Table> Table__cast(const std::shared_ptr<arrow::Table>& table,
                                          const std::shared_ptr<arrow::Schema>& schema,
                                          cpp11::list options) {
  auto opts = make_cast_options(options);
  auto nc = table->num_columns();

  using ColumnVector = std::vector<std::shared_ptr<arrow::ChunkedArray>>;
  ColumnVector columns(nc);
  for (int i = 0; i < nc; i++) {
    arrow::Datum value(table->column(i));
    arrow::Datum out =
        ValueOrStop(arrow::compute::Cast(value, schema->field(i)->type(), *opts));
    columns[i] = out.chunked_array();
  }
  return arrow::Table::Make(schema, std::move(columns), table->num_rows());
}

template <typename T>
std::shared_ptr<T> MaybeUnbox(const char* class_name, SEXP x) {