improve performance : sending binary data

                                                      |--------------|--------------|--------------|

                                                      | c            | c            | rust         |

                                                      | mysql        | mariadb      | mysql        |

------------------------------------------------------|--------------|--------------|--------------|

do 1000 parameters             - BINARY EXECUTE ONLY  | 29954 | 100% | 26881 |  90% | 29946 | 100% |

------------------------------------------------------|--------------|--------------|--------------|

static void BM_DO_1000_PARAMS_BINARY(benchmark::State& state) {

  MYSQL *conn = connect("");

  MYSQL_STMT *stmt = mysql_stmt_init(conn);

  // Build query with 1000 placeholders: "DO ?,?,?..."

  std::string query = "DO ?";

  for (int i = 1; i < 1000; i++) {

    query += ",?";

  }

  int rc;

  rc = mysql_stmt_prepare(stmt, query.c_str(), (unsigned long)query.size());

  check_conn_rc(rc, conn);

  int int_data[1000];

  MYSQL_BIND my_bind[1000];

  memset(my_bind, 0, sizeof(my_bind));

  for (int i = 0; i < 1000; i++) {

    int_data[i] = i + 1;

    my_bind[i].buffer_type = MYSQL_TYPE_LONG;

    my_bind[i].buffer = (char *) &int_data[i];

    my_bind[i].is_null = 0;

  }

  int numOperation = 0;

  for (auto _ : state) {

    do_1000_params_binary(state, conn, stmt, my_bind);

    numOperation++;

  }

  state.counters[OPERATION_PER_SECOND_LABEL] = benchmark::Counter(numOperation, benchmark::Counter::kIsRate);

  mysql_stmt_close(stmt);

  mysql_close(conn);

}