Your teammate has asked you to review the code below. Its purpose is to efficiently add a large number of small rows to a BigQuery table.

BigQuery service = BigQueryOptions.newBuilder().build().getService();
public void writeToBigQuery(Collection<Map<String, String>> rows) {
    for (Map<String, String> row : rows) {
        InsertAllRequest insertRequest = InsertAllRequest.newBuilder(
            "datasetId", "tableId",
            InsertAllRequest.RowToInsert.of(row)).build();
        service.insertAll(insertRequest);
    }
}

Which improvement should you suggest your teammate make?