improve performance of parsing Columns

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

                                                      | java         | c            |

                                                      | mariadb      | mariadb      |

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

Select 100 int cols            - BINARY EXECUTE ONLY  | 36631 | 115% | 31971 | 100% |

Select 100 int cols            - BINARY PIPELINE      | 17985 | 107% | 16793 | 100% |

Select 100 int cols            - BINARY               | 15742 | 113% | 13916 | 100% |

Select 100 int cols            - TEXT                 | 30226 | 108% | 27967 | 100% |

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

void select_100_int_cols(benchmark::State& state, MYSQL* conn) {

    int rc;

    rc = mysql_query(conn, "select * FROM test100");

    check_conn_rc(rc, conn);

    MYSQL_RES *result = mysql_store_result(conn);

    if (result == NULL) {

          fprintf(stderr, "%s\n", mysql_error(conn));

          mysql_close(conn);

          exit(1);

    }

    int val1;

    MYSQL_ROW row;

    while ((row = mysql_fetch_row(result))) {

        for (int i=0; i<100; i++)

            benchmark::DoNotOptimize(val1 = atoi(row[i]));

        benchmark::ClobberMemory();

    }

    mysql_free_result(result);

}