public function buildColumn($query, $column)
    {
        // TODO add support for indexBy
        /* @var $modelClass ActiveRecord */
        $modelClass = $query->modelClass;
        $key = $this->quoteValue($modelClass::keyPrefix() . ':a:');

        return $this->build($query, "n=n+1 pks[n]=redis.call('HGET',$key .. pk," . $this->quoteValue($column) . ")", 'pks');
    }