如何在Apache MetaModel中连接多个表？

import org.apache.metamodel.DataContext;
import org.apache.metamodel.MetaModelHelper;
import org.apache.metamodel.UpdateableDataContext;
import org.apache.metamodel.data.DataSet;
import org.apache.metamodel.data.Row;
import org.apache.metamodel.jdbc.JdbcDataContext;
import org.apache.metamodel.query.Query;
import org.apache.metamodel.schema.Column;
import org.apache.metamodel.schema.Table;

public class MultiTableJoinExample {
    public static void main(String[] args) {
        // 创建JdbcDataContext，连接数据库
        DataContext dataContext = new JdbcDataContext("jdbc:postgresql://localhost:5432/mydatabase", "username", "password");

        // 获取表的元数据
        Table table1 = dataContext.getTableByQualifiedLabel("schema1.table1");
        Table table2 = dataContext.getTableByQualifiedLabel("schema2.table2");

        // 创建查询
        Query query = new Query().from(table1).innerJoin(table2).on(table1.getColumnByName("column1")).equals(table2.getColumnByName("column2"));

        // 执行查询
        DataSet dataSet = dataContext.executeQuery(query);

        // 遍历结果集
        while (dataSet.next()) {
            Row row = dataSet.getRow();
            // 处理每一行数据
        }

        // 关闭连接
        dataContext.close();
    }
}