如何使用join选择knex上的特定列？

const knex = require('knex')({
  client: 'mysql',
  connection: {
    host: 'your_host',
    user: 'your_user',
    password: 'your_password',
    database: 'your_database'
  }
});

knex('table1')
  .join('table2', 'table1.id', '=', 'table2.table1_id')
  .select('table1.column1', 'table2.column2')
  .then(rows => {
    console.log(rows);
  })
  .catch(error => {
    console.error(error);
  });