关联查询如何只取特定列的数据 [ 2.0 版本 ]

$query = Compare::find()->select([
    'compare.new_table',
    'compare.create_at',
    'compare_diff.diff_rate',
])
    ->where([
    'compare.status' => 0,
    'cpr.pid' => $pid,
    'compare.storage' => 'hbase',
    'compare_diff.item_name' => 'c:m_haixuan_tag'
])
    ->joinWith([
    'cpr',
    'compare_diff'
])
    ->orderBy('compare_diff.id asc');

比如这个例子，select没啥用，实际上把关联表的数据都取出来了

'compare_diff'
])
    ->orderBy('compare_diff.id asc');