在用于java rxObservable的resultSet中不能聚合数据

import io.reactivex.Observable;
import io.reactivex.schedulers.Schedulers;

import java.sql.*;

public class ResultSetAggregationExample {
    public static void main(String[] args) {
        // 假设已经建立了数据库连接
        Connection connection = getConnection();

        // 执行查询语句
        try {
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT * FROM table");

            // 将ResultSet中的数据转换为Observable
            Observable.fromIterable(() -> new Iterator<Row>() {
                @Override
                public boolean hasNext() {
                    try {
                        return resultSet.next();
                    } catch (SQLException e) {
                        e.printStackTrace();
                        return false;
                    }
                }

                @Override
                public Row next() {
                    try {
                        return new Row(resultSet.getInt("id"), resultSet.getString("name"));
                    } catch (SQLException e) {
                        e.printStackTrace();
                        return null;
                    }
                }
            })
            .subscribeOn(Schedulers.io())
            .observeOn(Schedulers.computation())
            .reduce((accumulator, row) -> {
                // 在这里进行聚合操作，例如求和、求平均值等
                accumulator.setId(accumulator.getId() + row.getId());
                accumulator.setName(accumulator.getName() + ", " + row.getName());
                return accumulator;
            })
            .subscribe(result -> {
                // 输出聚合结果
                System.out.println("Aggregated Result: " + result);
            });

        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private static Connection getConnection() {
        // 建立数据库连接的代码
        return null;
    }

    private static class Row {
        private int id;
        private String name;

        public Row(int id, String name) {
            this.id = id;
            this.name = name;
        }

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        @Override
        public String toString() {
            return "Row{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    '}';
        }
    }
}